CUET Preparation Today
If $\pi (n)$= Number of primes less than or equal to n, n ∈ N, then what is the value of $\pi (40) $? |
14 12 11 10 |
12 |
The correct answer is option (2) :12 $\pi (40)$ Prime no. $≤ 40= 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37$ $∴\pi (40)= 12$ |
