1,3,6,10,___,21. Missing term in the sequence is

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Solution

The correct option is B 15
Triangular number series is given as 1,3,6,10,15,21,28,36....
The sum upto 'n' consecutive natural numbers is nth term of triangular series.
Therefore the missing term is 5th term in series and sum upto 5
i.e 1 + 2 + 3 + 4 + 5 = 15.

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