It’s sad. I made a silly mistake in P3 by not looking at a case and so, all my answers to that question are off by a few numbers. My P4 is correct and same as you guys. Assuming I made no calculation errors in P2(which is possible), I’ll get a 40. And I’m in class 12th. I have very low chances of getting through.
Probably the cutoffs will be 5 points lower than last years’ - for each class.
Firstly, I’m in Class 9…
I did Question 4 all correct but I’m not sure about Question 1 and 2. 3 screwed up completely (Didn’t take a case into account resulting in wrong answers)
For 1 got 80, 192 and 448. What is supposed to be the correct answer here? (Many people have given different answers)
For 2, 36, 49 and 96. 96 seems to be correct and some other people have got 36 as well (brute force, could have used combinatorics but I kinda screwed up)
Worst case scenario, I’m expecting 25 (96 + Question 4)
Although I think I’ve done Question 2 correctly…
Any ideas about the cutoff? (I hope it is 25…)
Correct answers:
1 - 75, 175, 399
2 - 40, 52, 96
3 - 71, 461, 3447
4 - 13, 10, 12
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im sure about 75 though not getting it
@xorfire Would be great if you also posted how to solve them(or some sort of hint) especially the first and second questions
Can anybody provide an explanation for 2 A?
Is it 36 or 40?
Most people have got either 36 or 40 in this thread. Which one is correct?
for first question just count the over countings. S=11011. if aSb=cSd then the string must have conjoined S’s. see the possibilities.
for the second, i counted the possibilities of 0 R, 2 R, 4 R, etc.
@ZIO2016:
quedtion 3 can be solved by exclusion and inclusion…any other method
@sanket1001 Question 3 can be solved using recursion, the recurrence relation being F(n) = n! - \sum\limits_{i=1}^{n-1} i! \cdot F(n-i)
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Guys the official keys are out! http://www.iarcs.org.in/inoi/2016/zio2016/zio2016-solutions.pdf
1 a. 75 b. 175 c. 399
2 a. 40 b. 52 c. 96
3 a. 71 b. 461 c. 3447
4 a. 13 b. 10 c. 12
Getting 40… class 11. Hope that’s enough to make the cut.
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This is my first time and I did quite bad… from what I remember of my answers I’m getting only last question fully right. Can anyone suggest efficient and logical ways of solving the other questions? Even if I arrive at an answer I’m not confident about it.
Hey does anyone know the cutoff for class 12 in this year’s ZIO? I am getting 40.
When are the results supposed to come? The week’s almost over…
I think i wont get i solved the first and last problem perfectly
Wat is the cut off
how was the answer 75 in the first question it should be 80.
n any idea abt when the result would be declared?
Sweg level: ∞
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