Question

6. The sum upto n terms of an A. P. is 48, first term is 20 and common difference is - 4. Find the number of terms. ​

Answer 1

Answer:

sn=1/2 {2a+(n-1) d}

48=1/2{2(20) +(n-1) ×-4}

96=20-2n+2

-74=2n

n=37

Answer 2

Answer:

HERE'S the answer to ur question dear