1.

1). 502). 523). 564). 64

Answer»

The pattern of the given PROBLEM is:

2 + (12 – 1) = 2

2 + (22 – 1) = 5

5 + (32 – 1) = 13

13 + (42 – 1) = 28

∴ ? = 28 + (52 – 1) = 52



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