Tuesday, 4 June 2019

SMO 2019 (Senior Section) Answers

SMO 2019 Senior Rd 2 Namelist

SMO 2019 Senior Rd 2 Questions

SMO 2019 Senior Questions

SMO 2019 (Senior Section) Answers
1. D
2. C
3. D
4. B
5. A
6. 32
7. 83
8. 30
9. 41
10. 8
11. 112
12. 22
13. 512
14. 1275
15. 82
16. 13
17. 10
18. 2187
19. 17
20. 3028
21. 268
22. 40
23. 2019
24. 23
25. 985

75 comments:

TheRaya said...

What's the cut off point for bronze this year?

Anonymous said...

What will 15 get me? The general consensus amongst my classmates is that this year is easier than last years, and last year was 16 for cut off for round 2

Anonymous said...

I think q8 is 60,

x=35 and y=12.5

Anonymous said...

X cant be 35 it does not yield 70 for first part

Anonymous said...

What is the cut off for silver this year?

Anonymous said...

Just curious what are some of ur scores?

Anonymous said...

That is the case where x < y. But the solution gives x > y. So you have to reject that solution.

Anonymous said...

how can q15 be 82

Unknown said...

yep got same ans too for y>x

Anonymous said...

Cos when x is 8 m is 82/9 so 9m is 82

Anonymous said...

q13 i subbed P(1) which yields 1024 but why must u multiply by half?

Anonymous said...

15 should be eligible for r2 minimum silver

Anonymous said...

my guess
HM:6/7
Bronze:11/12
Silver:13/14
Gold:18/19
R2:15

Anonymous said...

last year was easier imo

Anonymous said...

hello, newbie here. how does r2 results affect the award received?

Anonymous said...

Damn made the same mistake

Anonymous said...

I'm guessing 13

Anonymous said...

What are top 30 scores?

Anonymous said...

how is 3028 the max for q20

@Anonymous, regarding 3028 said...

You use the sequence (1,-2,1,-2,...,-2) giving a sum of -1009. 2019-(-1009)=3028. To my knowledge, this is optimal.

Anonymous said...

What about the sequence (4,-5,-2,1,...,-2,0)

Anonymous said...

What will 13 get me?

Anonymous said...

Nevermind I am careless

Anonymous said...

hey same i got 13

Anonymous said...

Is 18/25 a decent score?
I'm quite concerned because quite a lot of people did better than me.

Anonymous said...

what do u think the r2 cut off will be?

Anonymous said...

Can 15 get me to the 2nd round

Haydn Trumpet Conceeto said...

Will I get gold with 5? Most of my friends got 2

Anonymous said...

Sure

Kenneth said...

isnt q8 supposed to be 60?

Kenneth said...

What will a score of 6/25 get me haha

Anonymous said...

how do q 16

Anonymous said...

Any nice explanation for q20 my friends and i all guessed

Anonymous said...

For the final award received, I think r1 and r2 results are added together, so getting a high score in r1 won't guarantee a gold, and getting lower score in r1 can also give you a gold

Anonymous said...

What can I get with 13

Anonymous said...

I got 17, carelessly got qn1 wrong hehe, i feel this year's paper easier than 2018's since i only got 12 for that one...
Btw when will rnd 2 name list be released ahhh, uncertainty..
Can 17 secure a silver??

Unknown said...

Question 6 is 99997.

Anonymous said...

@Unknown You can test that; it isn't a factor.

Anonymous said...

I got 21 for 2018 and 13 for 2019 feels bad

Anonymous said...

Isnt q21 265 instead of 268?

Q20 said...

write numbers like this:

1 4 7 10 13 ...
-2 -5 -8 -11 -14 ...

if x_(n-1) is in the top row, next term is either to its right or below it. if it's in the bottom row, next term is either to its left or above it. this means that each negative number will always have a positive number to pair with, so the max is 2019-(-1)*1009=3028

Luke said...

My guess:

HM: 5-7
Bronze:8-10
Silver:11+
R2: 16

Anonymous said...

I see, thanks!

Anonymous said...

The difference between silver and round 2 cant be that much. Most of silver will be for those who went round 2.

Anonymous said...

not to burst your bubble of hope but a 5 is not GOLD, it is guaranteed SILVER

my take;
hm: 2
bronze: 3
silver: 4
gold: 7
round 2: 4

Anonymous said...

The Most Honourable Certificate of Participation

Anonymous said...

My guess:
HM 6-7
Bronze 9-10
Silver 12-14
Round 2 14-15

Anonymous said...

My guess:
HM 8-9
Bronze 10-12
Silver 13+
Round 2 14

Anonymous said...

Can someone explain Q18?

Anonymous said...

Let a = log2(x) and b = log2(log3(y))

Anonymous said...

Guys mind sharing how much yall got?
I got 15 and I got in.
COP should be lower than last year

Anonymous said...

I got 14 and I got in lol

Anonymous said...

Will I get silver with 13

Anonymous said...

Guys help how much do we need to get in round 2 to get gold?

TheRaya said...
This comment has been removed by the author.
Unknown said...

no. 23...my answer is 1009.

Anonymous said...

Wrong the answer is 2019

Anonymous said...

how to do q13

Anonymous said...

PLS LA not that hard one
hm: 0.2
bronze: 1.25
silver: 3.1415926
gold: 4.333333333

Anonymous said...

What is the cut off for silver???

Anonymous said...

Definitely 12 based on previous years where cut off for silver is 2 marks less than round 2 cutoff

Anonymous said...

Why I even thought 2009-2011 was easy
I could answer 16 for 2011 but only 13 for this year

Anonymous said...

Why does the answer q13 is 512?

Anonymous said...

got 20 but didn't get R2... strange this yr has high cutoff.

Amrit Lohia said...

For Q13, you substitute x=1 to get P(1)=1024, and P(1) is the sum of all the coefficients (both the even and the odd powers of x). Then you substitute P(-1) and get 0, and P(-1) is the sum of the even powers of x coefficients - the sum of the odd powers of x coefficients, since (-1)^even power = 1 and (-1)^odd power = -1. So the sum of the even powers coefficients - the sum of the odd powers coefficients = 0 and the sum of the even powers coefficients + the sum of the odd powers coefficients = 1024. Solving these simultaneously gives the sum of the odd powers coefficients and the sum of the even powers coefficients are both equal to 512, and the answer is the sum of the odd powers coefficients, i.e. 512.

Anonymous said...

Can upload round 2 questions?

Anonymous said...

Thoughts on this year paper? Felt q1 (geometry problem) was manageable, q2 idk what it was about, q3 was fairly easy but i am not sure if i proved fully, q4 was a scam, q5 was quite easy( ans is multiple of 2)?

Anonymous said...

when will the final result be released anybody knows tks

Anonymous said...

Probably end of July just like last year

Anonymous said...

im back wins gold hehe

Anonymous said...

Did result come out?

Anonymous said...

Yes results are out to schools

Unknown said...

How to get 32 for q6?

Randon sec 1 dude gonna take part in smo in 2020 said...

I DO NOT BELIEVE Q15 IS 50 i could just take 99+97 and leave it there and it will be done with.

Anonymous said...

Try expressing it as ax²+bx+c+d/(x+8)