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X 1 2 3 4 5 6
P(X) k 2k 3k 4k 5k 6k

where, k is a proportional constant.

∑P(X)=1

k+2k+3k+4k+5k+6k = 1

k= 1/21

P(3 dots) = 3* 1/21 =3/21 (Answer)

Answer: