1.

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 :

Answer»

221
400
231
211

Answer :C


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