Question

cards numbered from 7 to 49 are put in a box mixed throughly .a card is drawn from the box what is the probability that the no. written on it ( i ) a prime number ( ii ) a multiple of 7​

Answer 1

Answer:

Total number of events is 42

Prime no from 7 to 49 are 7, 11, 13, 17, 19, 23, 29, 31, 37, 41 ,43, 47,::, are 12 no .

So,

1.

P(e) = 12/42 = 6/21 = 2/7

And multiple of 7 are 7, 14, 21, 28, 35, 42, 49 are 7 no.

2.

P(e) = 7/42 =1/6