Instructions
What will come in place of the question mark (?) in the following number series ?
Solution
Numbers of the form $$n (n + 1)$$ are added, where n is natural number.
101 $$+ 1 \times 2$$ = 103
103 $$+ 2 \times 3$$ = 109
109 $$+ 3 \times 4$$ = 121
121 $$+ 4 \times 5$$ = 141
141 $$+ 5 \times 6$$ = 171
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