Insert the missing number in the following series. `1, 3, 6, 10, 15, …, 28, 36, 45 :`

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Q 2239178912.     Insert the missing number in the following series.

`1, 3, 6, 10, 15, …, 28, 36, 45 :`
A

`17`

B

`19`

C

`21`

D

`22`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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