Instructions

In the following questions a series is given, with one term missing. Choose the correct alternative from the given ones that will completethe series.

Question 21

1, 2, 8, ?, 148, 765

Solution

The series follows pattern as,

1 $$\times 1 + 1^2$$ = 2

2 $$\times 2 + 2^2$$ = 4 + 4 = 8

8 $$\times 3 + 3^2$$ = 24 + 9 = 33

33 $$\times 4 + 4^2$$ = 132 + 16 = 148

148 $$\times 5 +5 1^2$$ = 740 + 25 = 765

Missing term = 33

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