Question

A and B are complementary events. P(A) = 3 x P(B), calculate P (B)

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Complementary events mean that P (A) + P (B) =1

So can I take an algebraic approach and say
P(A)+3P(B)=1
x+3x=1
And to say P (B)=0.25

Answer 1

I think you meant to say

P(A) + P(B) = 1
3*P(B) + P(B) = 1

Answer 2

you are correct in saying that P(B) = 0.25

Answer 3

Thank you.

Answer 4

no problem

Answer 5

Oh yea I see the error I madeI was meant to write p (b)