Question

Find the sum of odd numbers from 15 to 29

Answer 1

Answer:

the sum of odd numbers is 176

Answer 2

Answer:

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

a=15

d=2

an=29

an= a+(n-1)d

29=15-2+2n

n=(29-13)/2

n=8

Sn=8/2{2(15)+(8-1)2}

=8/2{30+16-2}

=8/2(28+16)

=4(14+8)

=88

hence, sum of odd no. from 15to 29 is 88

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