Question

the probability of guessing the correct answer to a certain questions is x/2.if the probability of not guessing correct answer is 2/3 then find the value of x

Answer 1

Hey here's your answer


P(E) + P(Not E) = 1
P(E) = X/2
P(Not E) = 2/3

So, X/2 + 2/3 = 1
X/2 = 1 - 2/3
X/2 = 3-2/3 = 1/3
X = 2*1/3 = 2/3

Hope this helps!!
Cheers!!

Answer 2

Answer:

x/2 + 2x/3 = 1

3x+4x/6 =1

7x = 1*6

x= 6/7