Question

sum of 10th term and 20th term of an AP is 60 then find the sum of 14th and 16th term of an AP

Answer 1

Sum of 10th term and 20th term of an AP is 60
a+9d+a+19d=60
2a+28d=60
a+14d=30
the sum of 14th and 16th term of an AP is  a+13d+a+15d
                                                                     2a+28d
                                                                           =60