JEE Advanced 2012 Paper 2 Mathematics Q6

Mathematics

Problem

Four fair dice

D_1,D_2,D_3

and

D_4

, each having six faces numbered 1, 2, 3, 4, 5 and 6, are rolled simultaneously. The probability that

D_4

shows a number appearing on one of

D_1,D_2

and

D_3