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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770

by Anurag@Gurome » Mon May 28, 2012 8:50 am

R.K wrote:If 2^n=128,then (2^(n-1))(5^(n-1))=?

2^n = 128 ---> n = 7

Hence, (2^(n - 1))*(5^(n - 1)) = (2*5)^(n - 1) = 10^(7 - 1) = 10^6 = 1,000,000

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