1.

P(B) = 0.25, n(S) = 100, then what is n(B)? (A) 25 (B) 75 (C) 750 (D) 34​

Answer»

ong> P(B) = n(B) / n(S)

0.25 = n(B) / 100

0.25 × 100 = n(B)

n(B) = 25

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