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Question

Which of the following is not a triangular number?


Your Answer
A
1
Your Answer
B
3
Your Answer
C
6
Correct Answer
D
11

Solution

The correct option is C 11
Triangular numbers are obtained by adding consecutive natural numbers. Now, 
1=1
3=1+2
6=1+2+3

But 11(=1+2+3+5) can not be expressed in such a way. Hence, it is not a triangular number.

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