MBA Exam

what is the sum of coefficients in the expansion (3+2x)^99plz give approach

1) 5^99
2) 3^99
3) 2^99
4) 6^99

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MBA Other Question

http://postimage.org/image/40uy6x9zp/full/Please explain the method,..... in detail

1) A
2) B
3) C
4) D
5) E
Two urns contain 3 white and 4 black balls,and 2 white and 5 black balls. One ball is transferred to the second urn and then one ball is drawn from the second urn. Find the probability that the first ball transferred isblack, given that the ball drawn is black.

1) 15/39
2) 39/56
3) 8/13
4) 10/39
5) 5/13