Math, asked by marsaudayan, 2 months ago

Can anyone tell me the answer

please

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Answered by Krishrkpmlakv

3

Answer:

Step-by-step explanation:

The sum of first n natural numbers is n (n+1)/2

Answered by 651387

1

Answer:

(a) :- n(n-1)/2

n×n -1×n/2

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