Question

What is the sum of first 'n' odd natural numberd starting from 11 *

1 point



a)



b)



c)




​

Answer 1

Answer:

n

$\times$

n+1/2

Step-by-step explanation:

its a formula

Answer 2

Answer:

n^2+10n

Step-by-step explanation:

a=11

d=2

No.of terms=n

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

=n/2[2(11)+(n-1)2]

=n/2[22+2n-2]

=n/2×2(11+n-1)

=n×(10+n)

=10n+n^2

Sum of n terms=n^2+10n

HOPE THIS BRING A SMILE IN YOUR FACE