Question

The first term of an ap is 3 the last term of a term is 83 and the sum of all terms is 903 find the number of first and the common difference of an ap

Answer 1

Step-by-step explanation:

a=3

an=83

sn=903

Using formula

Sn=n/2(a+an)

903=n/2(3+83)

903=43n

903/43=n

21=n

an=a+(n-1)d

83=3+(21-1)d

83-3=20d

80=20d

d=4

Answer 2

above attachment is the answer to your question