Question

there are 20trrms in an arithmetic sequence. the sum of first and last term is 88. what is the sum of 2nd and 19th terms?​

Answer 1

Given

Total number of terms = 20

Terms are in AP

Sum of first and the last term = 88

$\implies a + a + 19d = 88\\\implies 2a+19d = 88 -- (1)$

To find

Sum of the second and 19th term

$\implies a+d+a+18d=?\\\implies 2a + 19d=?--(2)$

Equations (1) and (2) are same

Therefore,

2a + 19d = 88

                                                   

Answer 2

Answer:

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