Question

if a1,a2, a3, .....,a7 are in ap and if a4=10 then a1+a7=? ​

Answer 1

a4=10

a+3d=10

a=10-3d

a1+a7:

=a+a+6d

=2a+6d

=2(10-3d)+6d

=20-6d+6d

=20

Answer 2

I have written it by myself please mark it as the brainllist if it will help you
please say thanks for this answer too