Question

There
are
boards numbered 1 to 50 in a
box.one board is selected at random
find the probability
that the number on
the board is (1) a multiple of 11
(2) a prime number
(3) a multiples of 10.
​

Answer 1

Step-by-step explanation:

Given:-

S={1,2,3,....,50}

(1) no. of elements multiple of 11 in S. implies that A={11,22,33,44} |A|=4

1. probability of multiple of 11=|A|/total=4/50=2/25

(2) no. of primes in S. Implies that

B={2,3,5,7,11,13,17,19,23,29,31,37,41,43,47}; |B|=15

2. probability of prime no.s= |B|/total=15/50=3/10

(3) multiple of 10.implies that

C={10,20,30,40,50} ; |C|=5

3. probability of multiple of 10=|C|/total=5/50=1/10