Question

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

Answer 1

probability of getting correct ans + probability of not getting correct ans =1
so ,
x/2 + 2/3=1
》
$(3x + 4) \div 6 = 1$
》
3x+4=6
》
3x=2
》
x=2/3

so the value of x is 2/3