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Question: Let A = {2, 3, 4,…., 20}. A number is chosen at random from set A & it is found to be a prime no. Th...

Let A = {2, 3, 4,…., 20}. A number is chosen at random from set A & it is found to be a prime no. The probability that it is more than 10 is :

A

110\frac { 1 } { 10 }

B

15\frac { 1 } { 5 }

C

910\frac { 9 } { 10 }

D

None

Answer

None

Explanation

Solution

A = {2, 3, 5, 7, 11, 13, 17, 19}

\ T.C. = 8 F.C. = {11, 13, 17, 19} \ F.C. = 4 ̃ P = 12\frac { 1 } { 2 }