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Find the sum 2,7,12,......,to 100 terms

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Find the sum 2,7,12,......,to 100 terms

Posted by Pihu ✨ 4 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 4 years, 10 months ago

Here a=2,n=100

And d=7−2=5

Sn= n/2 [2a+(n−1)d]

S₁₀₀ = 100/2 [2(2)+(100−1)5]

= 50[4 + 495 ]

= 50(499)

=24950

2Thank You

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CBSE > Class 10 > Mathematics