Question

The first and last term of AP is 1 and 121 respectively.find the number of term in the AP and the common difference between them if the sum is 971

Answer 1

Step-by-step explanation:

if a and l are first and last terms in AP then the sum of AP S=n/2(a+l)

971=n/2(1+121)

971=n(61)

n=971/61

n=15.9180328

n is a natural number and we got decimal that is not a natural number

so given information is 8nvalid.