Question

if the sum of first 8 terms of ap is 136 and that of first 15terms is 465then find the sum of first 25terms​

Answer 1

hi friend the sum of 25 terms is 1275

pls refer my attachment

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Answer 2

Answer:

The formula for sum of n terms of an Arithmetic progression is given by

Sum of first 8 terms is 136, this means

Sum of first 15 terms is 465, this means

Solving the both the equations for "a" and "d" we get a=3 and d=4.  Now sum of first 25 terms is given by

Step-by-step explanation:

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