20 cards numbered 1 2 3 ...... 20 are put in a box and mixed throughly shashi draws a cards from the box find the probability that the no on the cards is
Odd , even, prime , divisible by 3 , divisible by 3 and 2
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n(s) =20
A=If it's odd number than
{1,3,5,7,9,11,13,15,17,19}
n(a)=10.
P(A) =n(A) /n(S)
10/20
2.
B=if the number is even
B ={2,4,6,8,10,12,14,16,18,20}
n(B) =10
P(B)=n(B)/n(S)
10/20
2.
C=if it's a prime number
C={1,2,3,5,7,11,13,17,19}
n(C) =9
P(C) =n(C) /n(S)
9/20.
D=if the number is divisible by 3.
D={3,6,9,12,15,18}
n(D) =6
P(D)=n(D)/n(S)
6/20
2\10
E=if the number is divisible by 3&2.
E={6,12,18}
n(E)=3
P(E)=n(E)/n(S)
3/20.
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