If $\pi (n)$= Number of primes less than or equal to n, n ∈ N, then what is the value of $\pi (63) $?
Answer & explanation
Correct answer: option 4
The correct answer is option (4) :18
$\pi (63)$
Prime no. $≤ 63= 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61$
$∴\pi (63)= 18$