Question

the sum of the first 12th the term of AP 1,3,5,7 is____​

Answer 1

Answer:

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

a=1

d=3-1

=2

S12=12/2(2•1+(12-1)•2

=6(2+22)

=6(24)

=144

Sum of first 12 terms of AP is 144.

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