Math, asked by bhartinavyakanak, 10 months ago

pls answer my question

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Answered by dhavaldomadiyalifest

1

Answer: visit R KUNJ VIDEOS ON YOUTUBE

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Answered by SalmanMalik07

0

Answer:

1st term ,a=5

last term ,l=45

sum=400

By the formula

s(n)=N/2(a+ l)

so ,400=n/2(5+45)

400=n/2*50

400=25n

n=400/25

n=16

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