Question

In an given A.P. first part given a=5,d=3,an=50.Find n and sn?

Answer 1

Answer:

an=a+(n-1)d

50=5+(n-1)3

50=5+3n-3

50=2+3n

50-2=3n

48=3n

n=48/3n

n=16

sn=n/2 (a+an)

sn=16/2 (5+50)

sn=8 (55)

sn=495...

Nischitha chiranjeevi...❤