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If $\pi (n)$= Number of primes less than or equal to n, n ∈ N, then what is the value of $\pi (63) $? |
22 16 20 18 |
18 |
The correct answer is option (4) :18 $\pi (63)$ Prime no. $≤ 63= 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61$ $∴\pi (63)= 18$ |
