Author: kstv Posted: Thu Mar 11, 2010 5:56 pm (GMT -8) 1) The probability of answering a question is 3ways. So answering 10 Qs is 3^10 This is a big no. but 3 ¹ = 3 3²= 9 3³= 27 3^4 = 81 the last digit repeat inthe order 1,9,7 and 1 This tech.

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GMAT Math :: RE: Need Help: Counting methods & Probability questions