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MathRevolution
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MathRevolution
If\(n=2^23^35^37\), how many factors of n are there?

A. 18
B. 36
C. 54
D. 96
E. 108

Number of factors of \(n=2^23^35^37\) => (2+1)*(3+1)*(3+1)*(1+1) = 3*4*4*2 =96

Hence Option D is correct
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Small point to make: the formula that people are using will help us determine the total number of POSITIVE divisors (factors).
It's worth noting that -1, -2, -3, -6 etc are also factors of (2²)(3³)(5³)(7), in which case the answer is actually 192 (96 positive factors and 96 negative factors)

From the Official Guide: If x and y are integers and x ≠ 0, then x is a divisor (factor) of y provided that y = xn for some integer n. In this case, y is also said to be divisible by x or to be a multiple of x.
For example, 7 is a divisor or factor of 28 since 28 = (7)(4), but 8 is not a divisor of 28 since there is no integer n such that 28 = 8n.


Given that the factors of a given integer can include negative integers, the GMAT test-makers restrict the discussion to POSITIVE integers, as in "If n =(2²)(3³)(5³)(7), then how many POSITIVE factors of n are there?"

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==> The number of factors becomes (2+1)(3+1)(3+1)(1+1)=96, hence the answer is D.

Answer: D
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MathRevolution
If\(n=2^23^35^37\), how many factors of n are there?

A. 18
B. 36
C. 54
D. 96
E. 108

10 sec solution....

\((2+1)(3+1)(3+1)(1+1)=96\)

Answer must be (D) 96
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