The next number of the sequence 51 , 52 , 56 , 65 , ...

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The next number of the sequence 51 , 52 , 56 , 65 , ... is :

1. 75
2. 78
3. 79
4. 81

Correct Option: D

The pattern of the sequence is :
First term = 51
51 + 1² = 51 + 1 = 52
52 + 2² = 52 + 4 = 56
56 + 3² = 56 + 9 = 65
65 + 4² = 65 + 16 = ?
∴ ? = 81
Thus , the next number of the sequence is 81 .