Bag contain 20 tickets numbered 1 to 20, two ticket are drawn at random.find the probability that ,on one there is prime number and on other there is multiple of 4?

CBSE Class 12-science Answered

Bag contain 20 tickets numbered 1 to 20, two ticket are drawn at random.find the probability that ,on one there is prime number and on other there is multiple of 4?

Asked by Jerin Shaji | 24 Feb, 2018, 07:31: PM

Expert Answer

$begin mathsize 16px style total space tickets equals 20 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space prime space no equals 2 comma 3 comma 5 comma 7 comma 11 comma 13 comma 17 comma 19 equals 8 space space space space space space space space space space space space space straight P left parenthesis prime space no. right parenthesis equals 8 divided by 20 space space space space space space MULTIPLE space OF space 4 equals 4 comma 8 comma 12 comma 16 comma 20 equals 5 space space straight P left parenthesis MULTIPLE space OF space 4 right parenthesis equals 5 divided by 20 equals 1 divided by 4 space space straight P left parenthesis space open parentheses prime space no. close parentheses intersection open parentheses MULTIPLE space OF space 4 close parentheses right parenthesis equals straight P left parenthesis prime space no. right parenthesis plus straight P left parenthesis MULTIPLE space OF space 4 right parenthesis minus straight P left parenthesis space open parentheses prime space no. close parentheses union open parentheses MULTIPLE space OF space 4 close parentheses right parenthesis equals 8 over 20 cross times 5 over 20 minus 0 end style$

Answered by Arun | 25 Feb, 2018, 12:14: PM