Question

Can you solve Q.14
It's urgent please

Answer 1

Given,First term is(a+b) .second term is (b+c) .common difference=(b+c)-(a+b)
=b+c-a-b
=c-a
Third term (T3)=a+2d
=a+b+2(c-a)
=a+b+2c-2a
=b+2c-a