Math, asked by rohit807, 1 year ago

solve this question quickly immediately fast I am in danger

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Answered by ttsbjeddah

0

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

S20=20/2[2*8 + (20-1)-5

=10[16 + (19*-5)

=10[16 + (-95)]

=10*-79

= -790

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