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Friday, May 1, 2009
Problem 4 - GMAT Number Properties
How many different factors does 120 have, excluding 1 and 120?
16-2 is correct! and I agree with blaoism - the generic formula for the number of factors for a number expressed in the form:(a^x).(b^y).(c^z)=(x+1)(y+1)(z+1) and that includes 1 and the number itself.
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ReplyDelete120 = 3.5.2^3
ReplyDelete#factors = (1+1)(1+1)(3+1) = 16
16 - |{1,120}| = 14
16-2 is correct!
ReplyDeleteand I agree with blaoism - the generic formula for the number of factors for a number expressed in the form:(a^x).(b^y).(c^z)=(x+1)(y+1)(z+1) and that includes 1 and the number itself.
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