Question

the first term and common diffrence of an ap is 8 and 6. find the 25th term and sum of lst 25 terms​

Answer 1

Answer:

Given, first term and the common difference of an AP is 8 and 6

i.e. a=8 and d=6

Step-by-step explanation:

a=8 and d=6

a25=a+24d

     =8+24(6)

    =8+144

   =152

∴ a25=152

S25=n/2[a+an]

      =25/2[8+152]

      =25/2[160]

     =25 X 80

      =2000

∴ S25=2000