Question

. A bag contains 5 red, 8 black and 7 white balls. One ball is chosen at random. What is the probability that the chosen ball is black​

Answer 1

Sample space :

S = {R1, R2, R3, R4, ,R5, B1, BE, B3, B4, B5, B6, B7,B8, W1, W2, W3, W4, W5, W6, W7}

n(S) = 20

Event A : One ball is chosen at random will be black

n(A) = { B1, B2, B3, B4, B5, B6, B7, B8}

n(A) = 8

P(A) = n(A)/ n(S)

= 8 /20

= 2/5