Question

A box contain cards no 11to23 .a card is drawn at randimfrom the box. find the probability that the numberon the drawn cardsis (1)a square of no (2)a multiple of7

Answer 1

find out the total no. of elements in total between 11 and 23. it is , 12 elements . now for the first part let us find out the no. which are squares . There is only 16 which is a square of 4 . therefore the probability will be total no. of square no. i.e 1 upon total no. of elements i.e. 12 therefore probability for finding a square no . is 1/12

similarly , the multiple of seven between 11 and 23 are 14,21 . there fore probability will be 2/12 .

hope it helped ,.