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## Answers

let a=1

1+5d=121

5d=120

d=24

a+5*24=121

a+120=121

a=1 ------------------------------------------(i)

s11=11/2(2*1+10*24)

s11=11/2(2+240)

s11=11/2*242

s11=11*121

s11=1331

**ANS**

sn=n*center term(this is a formula to find the sum of an A.P if it's number is an odd)

=11*121=1331