Math, asked by saigogada123, 6 months ago

find sum by process not directly

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Answered by sahil472745

0

Answer:

84 I think............

Answered by Anonymous

1

Answer:

s=1+3+6+10+15+21+28

s= 10+10+15+49

s=20+15+49

s= 35+49

s= 84

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