Question

A number is selected from the numbers 1,2,3,4 ....., 25. The probability for it to be divisible by 4 Or 7 is........

​

Answer 1

Answer:

Let S be the sample space

S ={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25}

n(S) = 25

let A be the event for getting number divisible by 4 or 7

A={4,7,12,14,16,20,21,24}

n(A)= 8

p(A)=n(A)/n(S)

= 8/25

therefore possibility to get number divisible by 4 or 7 is 8/25