Question

which is the following triangular number?
(A) 21
(B) 36
(C) 45
(d) 54​

Answer 1

Answer:

I think so A answer.... .

Answer 2

Answer:

Good question

Step-by-step explanation:

d)54 is not a triangular number.

This are the Triangular number

(A) 21

(B) 36

(C) 45

See the attached picture for better understanding

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