Question

A box contain tickets numbered from 16.3 tickets are to be chosen to give 3prizes what is the probablity that at least 2tickets contain a number which is multiple of 4​

Answer 1

Answer:

Step-by-step explanation:

In 1 - 16

4,8,12,16 are the multiples of 4.

total 4 of them are multiples of 4.

remaining 12 are not multiples of 4.

no of tickets to be picked = 3

at least 2 tickets must be multiple of 4.

probability of at least 2 are multiples of 4 = prob of getting 2 out of 3 tickets as multiples of 4 + prob of getting 3 out of 3 tickets as multiples of 4.

probability of getting 2 out of 3 tickets as multiples of 4 when 3 tickets are picked from the 16 tickets.

4/16 * 3/15 * 12/14

= 3/70

probability of getting 3 out of 3 tickets as multiples of 4 when 3 tickets are picked from the 16 tickets.

4/16 * 3/15 * 2/14

=1/140

3. + 4.

3/70 + 1/140

= 7/140

probability of at least 2 are multiples of 4 = 1/20