In series 1, only one number is wrong. If the wrong number is corrected, the series gets established following a certain logic. Complete series 2 with same logic and answer the given question.
| Series 1: | 2 | 3 | 2 | 15 | 76 | 245 | 1434 |
| Series 2: | 3 | a | b | c | d | e | f |
What will come in place of (c) ?
Explanation
The given number series 1 follows the logic
⇒ 2×1+1²= 3
⇒ 3×2-2²= 2
⇒ 2×3+3²= 15
⇒ 15×4-4²= 44
⇒ 244×5+5²= 245
⇒ 245×6-6²= 1434
Similarly, series 2
(a)⇒ 3×1+1²= 4
(b)⇒ 4×2-2²= 4
(c)⇒ 4×3+3²= 21
Hence, Option D is correct
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