Question

Find the sum to 30 terms of the ap a-b, a, a+b​

Answer 1

Answer:

1st term=a-b

common diff=a-(a-b)=a-a+b=b

sum=(30/2){2(a-b)+(30-1)b}

=15{2a-2b+29b}

=15{2a+27b}

=30a+405b Ans