Question

A box consists of 6 red, 8 black and 11 white balls. One ball is
drawn out at random. Find the probability that the ball drawn is:
1.Neither black nor red
2.Red or white​

Answer 1

A box consists of red is random

Answer 2

Answer:

let S be the sample space

therefore, S={R1,R2,R3,R4,R5,R6,B1,B2,B3,B4,B5,B6,B7,B8,W1,W2,W3,W4,W5,W6,W7,W8,W9,W10,W11}

n(S)=25

1] Let A be the event where the ball is neither black nor red

A={W1,W2,W3,W4,W5,W6,W7,W8,W9,W10,W11}

n(A)=11

P(A)=n(A)/n(S)=11/25

2]Let B be the event where the ball is red or white

B={R1,R2,R3,R4,R5,R6,W1,W2,W3,W4,W5,W6,W7,W8,W9,W10,W11}

n(B)=17

P(B)=n(B)/n(S)=17/25