1.

3 15 _ 51 53 159 161

Answer»

Observe the SEQUENCE:

5 * 3 = 15

51 + 2 = 53; 53 * 3 = 159; 159 + 2 = 161

So _ will be 15 + 2 = 17 (also 51/3 = 17).

Observe the sequence:

5 * 3 = 15

51 + 2 = 53; 53 * 3 = 159; 159 + 2 = 161

So _ will be 15 + 2 = 17 (also 51/3 = 17).



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