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GMAT.IQ
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Hi, does anyone know the odd one out pls?
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Instead of using that formula, I would just list out the possible factors. It’s 2, 4, 2xp, 2x4xp.

Also, do you know how that formula is derived?
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Listing out won’t work for large numbers lets say I give you 2^208 P^99

can you list out all the factors in this chat

all the even factors @GMAT.IQ please list out
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I agree that formulas is necessary sometimes especially since GMAT has a time constraint. However, for this problem, it’s better to list it out since the number is so small.
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I know how that formulae is derived if you need an explanations please come to my DM
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I just listed it out for you. 2, 4, 2xp, 4xp.

I know how it’s derived. I was making sure you knew how.
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List out for 2^208 P^99
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If you know how it’s derived, then it easy to just list out the number of factors.
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My point is listing out is not a smart way for GMAT
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In this problem, it is because the number is so small. I think people tend to rely on formulas too much.
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Derivation is number of ways of selecting n identical numbers

that’s is n+1

I don’t rely on formulae but always use last results make up for a fast answer
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Not sure what you mean by selecting n identical numbers…

The formula comes from a calculating a permutation.
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You need an IQ for that to understand @GMAT.IQ
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Not sure why you’re being combative…
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I am just trying to defend my approach
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In the problem here, if you use your formula, the number of divisors is 6. Now, how do you know which ones are even? You have to eliminate 1 and p. You have to list them out anyway. Do you see what I mean?

Well, you can both be defending your approach and being combative. It’s not mutually exclusive.
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man if we need to calculate even divisor we need to reduce power of 2 by 1 so that remaining number will always be 1

makes sense ?

*even
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