Math, asked by naveenkumar008, 11 months ago

find the sum of 7+14+21+.....+490

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Answered by Nobody12345

3

Please mark this as brainliest.

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Answered by vijaya2002

2

a=7 ,d=7

490=a+(n-1)d

490=7+7n-7

7n=490

n=70

Sn=n(a1+a70)/2

70(497)/2

=17395

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