Question

Last term of ap is -6. Find the common difference and number of terms of ap. If it's 15 and 25 terms are 9 and 4 respectively

Answer 1

Answer:

a15= a+14d

9= a+14d

a25=a+24d

4= a+24d

9= a+14d

-. -. -

10d=-5

d= -1/2ans