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Q.

Which of the following is not a triangular number?

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a

10

b

6

c

3

d

5

answer is B.

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Detailed Solution

The given numbers are 3, 5, 6 and 10.

Here, 3, 6 and 10 can be represented as given image below respectively. 

Question Image

Therefore, 3, 6 and 10 are triangular numbers.

But 5 can be represented as

Question Image

which implies it is not a triangular number.

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