Question

The first term of an ap is 3 the last term is 83 and the sum of all its term is 903. Find the no. Of terms and the common difference

Answer 1

Answer:

n=21 ,d=4

Step-by-step explanation:

a=3

an=83

sn=903

sn=n/2(a+l)

903 = n/2(3+83)

903*2=n(86)

1806/86=n

21=n

an=a+(n-1)d

83=3+20d

80/20=d

4=d