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As a and b are independent events.
P(A intersection B) = P(A).P(B)
N of (A intersection B) / 10 = N(A) .N(B) / 100 = 4 * N(B) /100
5 * N(A intersection B) = 2N(B)
5 | 2 N(B) ==> 5 | N(B) doesnot divide 2
therefore N(B) = 5 or 10
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