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GMAT Prep Test 2

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GMAT Prep Test 2

by dsuna » Mon Mar 26, 2007 12:14 pm
For any positive integers n, the length of n is defined as the number of prime factors whose product is n. For example, the length of 75 is 3, since 75 = 3x5x5. How many two-digit positive integers have length 6?

Ans. Two
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by 800GMAT » Mon Mar 26, 2007 1:18 pm
The answer is 2

64= 2.2.2.2.2.2
94= 2.2.2.2.2.3

Any other combination of powers of 2 and 3 gives a three digit number.
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by Cybermusings » Tue Mar 27, 2007 4:04 am
800GMAT's explanation is fine...Except that it's 96 and not 94
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