Question

If the sum of 49 terms of an A.P. is 100 and 50th term is 25 then find the sum of 50 terms.

Answer 1

Answer:

On the basis of observations :

Sum of n term from starting = nth term + sum of ( n - 1 ) terms.

So here,

Sum of 49 terms = 100

50th term = 25

Therefore,

→ sum of 50 terms = 50th term + sum of 49 terms

→ sum of 50 terms = 25 + 100

→ sum of 50 terms = 125

Hence the required sum is 125