Question

What is the sum of two consecutive triangular numbers ?
Illustrate using figures.
(you may use circles instead of stars as circles will be easier to draw)
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Answer 1

Answer:

take first consecutive number be =X

and take second consecutive number be =X+1

Step-by-step explanation:

they asked the sum of two consecutive number

so we need to add the consecutive number

X+X+1=2X+1

THIS IS THE ANSWER

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