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25-10-2020
Mathematics

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find the sum of all the multiples of 9 between 0 and 200

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itsyagurllilyan itsyagurllilyan

25-10-2020

Answer:

n=200-0 /9=200/9=22.222

n~22terms

a=9

d=9

Sn=(n/2)(2a+(n-1)d)

S22=(22/2)(2*9+(22-1)9)

S22=11(18+(21)9)

S22=11(18+189)

S22=11(207)

S22=2277

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