What should come in place of '?' in the given series?
3 ,21, 111, 561, 2811, ?

Given Series: 3, 21, 111, 561, 2811, ?
Logic:  the pattern of multiply by 5, then add 6 .
3 × 5 + 6 = 15 + 6 = 21
21 × 5 + 6 = 105 + 6 = 111
111 × 5 + 6 = 555 + 6 = 561
561 × 5 + 6 = 2805 + 6 = 2811
Now, let's apply the same logic to find the next number:
2811 × 5 + 6 = 14055 + 6 = 14061

Correct answer is (c) 14061.