CAT Level Question from Number Theory

1. Number Theory

2. Number Theory
If f(x) is the number of primes less than or equal to x, find the value
of f(90) - f(80) = ?
(a) 3 (b) 2
(c) 1 (d) 4

3. Number Theory
Solution:
f(90) - f(80) = Number of primer between 90 and 80.
Listing, we have 83 and 89.
f(90) - f(80) = 2
Answer Choice (B)
If f(x) is the number of primes less than or equal to x, find the value
of f(90) - f(80) = ?

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