CUET Preparation Today
If $σ_k(n)$= Sum of kth powers of all the positive divisors of n, n ∈ N, the what is the value of $σ_3(4)$ ? |
65 67 73 77 |
73 |
The correct answer is option (3) : 73 $σ_3(4)$ Positive divisions of 4 are $ 1, 2, 4$ $∴σ_2(12)= 1^3+2^3+4^3$ $=1+8+64$ $=73$ |
