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Scoretop 10 - Question 4

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by kajcha » Thu Sep 27, 2007 7:21 am
I will backsolve it. 20 is one of the option and from the question we know that 2 and 20 are in n. So 20 will be the answer.

my answer - E

What's the OA?
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by akay » Thu Sep 27, 2007 7:35 am
kajcha apologies. the question should read 2^k and the OA is D.
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by kajcha » Thu Sep 27, 2007 7:56 am
That's what I was wondering.. Let me have a look again
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by kajcha » Thu Sep 27, 2007 8:15 am
Write each even no as factors of 2

2 = 2*1
4 = 2*2
6 = 2*3
8 = 2*2*2
10 = 2*5
12 = 2*2*3
14 = 2*7
16 = 2*2*2*2
18 = 2*9
20 = 2*2*5

Count nos of 2s = 18. Ans D
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