Question

find the sum of 1+6+11+.......+51.​

Answer 1

Answer:

1+6+11+16+21+26+31+36+41+46+51 is 286

Answer 2

Answer:

First term=1

Common difference=6-1=5

Last term =51

51=1+(n-1)5

5n=55

n=11

Sum = n/2(first term+last term)

=11/2(1+51)

=11×26

=286

HOPE IT WILL HELP YOU