Question

If a=10,d=10 find s100​

Answer 1

by using the formula

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

S100=100/2[2×10+(100-1)10]

=50(20+990)

=1010×50

=50500

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Answer 2

Answer:

Hey buddy here is the answer

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

= 100/2 (2×10+(100-1)10)

=50(20+99×10)

=50(20+990)

=50(1010)

=50.550

therefore,

the sum of 100 terms in AP is 50,550

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