# A box contains 19 balls bearing numbers 1,2,3,.....,19 .A ball is drawn at random from the box. Find the probability that the number on the ball is:- i)a prime number ii)divisible by 3 or 5 iii) neither divisible by 5 nor by 10 iv) an even number

2
by rp4oi8pSahros

2016-02-03T22:25:28+05:30
Sample space for prime number=1,2,3,5,7,11,13,17,19
sample space for number divisible by 3 or 5=3,5,6,9,10,12,15,18
sample space for number not divisible by 5 nor 10=1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19
sample space for even number=2,4,6,8,10,12,14,16,18
p(e)=possible no. of outcomes/total no. of outcomes

(I)p(e)=9/19
(II)p(e)=8/19
(III)p(e)=17/19
(IV)p(e)=9/19
2016-02-03T22:44:28+05:30
===even number=2,4,6,8,10,12,14,16,18
=== prime number=1,2,3,5,7,11,13,17, 19
===numbers  divisible by 3 or 5=3,5,6,9,10,12,15,18
===numbers which do not  divisible by 5 nor 10=1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19

p(e)=possible no. of outcomes/total no. of outcomes
1) 9/19
2)8/19
3)16/19
4)9/19
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