MathRevolution wrote:
[GMAT math practice question]
If n is the product of 3 different prime numbers, how many factors does n have except 1 and n?
A. 6
B. 7
C. 8
D. 9
E. 10
Let the 3 different prime numbers be a,b,and c.
If\(n = a^x*b^y*c^z\) where x,y, and z are the powers of the respective prime numbers
then the number "n" has\((x+1)(y+1)(z+1)\) factors .
In this case, x=y=z=1, the number n will have 2*2*2 or 8 factors.
Therefore, excluding 1 and n, the number
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