Question

Find out wrong number serious 3,10,21,64,229,356,777

Answer 1

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Kid's style:
10–3 = 7

21–10 = 11 = 7 + 4

36–21 = 15 =11 + 4

55–36 = 19 = 15 + 4

Answer: 55 + 19 + 4 = 78

Men's style:
x=n×(2n+1)

where n is a natural number.

1×(2∗1+1)=3

2×(2∗2+1)=10

3×(2∗3+1)=21

So answer is 78

6×(2∗6+1)=78

:
1 square + 1 square + 1 = 3

2 square + 2 square + 2 = 10

3 square + 3 square + 3 = 21

4 square + 4 square + 4 = 36

5 square + 5 square + 5 = 55

So, the next number will be:

6 square + 6 square + 6 = 78

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Answer 2

356 is wrong number in series