A box contains cards bearing numbers between 5 and 70. If one card is drawn at random , find the probability that it is a number divisible by 5 or 10. (Please give the answer neatly if written down)
Answers
Given : A box contains cards bearing numbers between 5 and 70.
one card is drawn at random
To Find : Probability that it is a number divisible by 5 or 10.
Solution:
A box contains cards bearing numbers between 5 and 70.
are 6 , 7 , ..................................., 68 , 69
Hence Total cards = 64
Number Divisible by 5
10 , 15 , ................................60 , 65
Total numbers are = 65 = 10 + (n - 1) 5
=>55 = (n - 1) 5
=> 11 = n - 1
=> n = 12
12 Numbers
5 is a factor of 10 Hence number Divisible by 10 are already considered
probability that it is a number divisible by 5 or 10 = 12/64
= 3/16
= 0.1875
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