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The following sequence is given below: ...

The following sequence is given below:
1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,6,6,….` etc.
The sum of the 1st, 2nd , 4th , 7th , 11th , 16th , ..211 th` term is :

A

221

B

400

C

231

D

211

Text Solution

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The correct Answer is:
C
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