Question
Let ‘a’ be the number of prime numbers from 1 to 50,
and ‘b’ be the number of prime numbers between 51 and 75. What is the value of a × b?Solution
ATQ,
Number of prime numbers from 1 to 50 = a = 15
Prime numbers from 51 to 75 are: 53, 59, 61, 67, 71, 73 → Total = 6
So, b = 6
a × b = 15 × 6 = 90
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