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# In the problem below, AB, CD, and EF are two-digit numbers, where A, B

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Re: In the problem below, AB, CD, and EF are two-digit numbers, where A, B [#permalink]
BrentGMATPrepNow wrote:
sanjitscorps18 wrote:
(1) B and D are consecutive integers.
Hence the following combinations are possible
1,2 = 3 (Prime)
2,3 = 5 (Prime)
3,4 = 7 (Prime)
4,5 = 9 (Non-Prime)
5,6 = 11 (Prime)
Here we get both prime and non prime hence insufficient

(2) C = 8.
If C is 8 then A has to be 1 with no carry over from ones digits. In that case the below combinations for B and D are valid
1,2 = 3 (Prime)
2,3 = 5 (Prime)
3,4 = 7 (Prime)
4,5 = 9 (Non-Prime)
For the above combination it is not sufficient

Even combining, we get prime and non prime numbers for F hence Option E

Be careful. If A = 1, B = 4, C = 8 and D = 5, then the sum is 99, and we're told A, B, C, D, E and F represent distinct digits from 1 to 9.

Thanks BrentGMATPrepNow
I did overlook that.

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Re: In the problem below, AB, CD, and EF are two-digit numbers, where A, B [#permalink]
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This question is a part of Are You Up For the Challenge: 700 Level Questions collection.
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Re: In the problem below, AB, CD, and EF are two-digit numbers, where A, B [#permalink]
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Re: In the problem below, AB, CD, and EF are two-digit numbers, where A, B [#permalink]
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