Question

If an ap the first term is 22 nth term is -11 and s of first n terms is 66. Find n and d

Answer 1

Answer:

Step-by-step explanation:

given,a=22

nth term = -11

Sn=66

a=a+(n-1)d

-11=22+(n-1)d ------(i)

Sn=n/2[a+nth term]

66=n/2[22+-11]

132=n[11]

132/11=n

n=12--------(ii)

substituting eq(ii) in eq(i)

-11=22+(12-1)d

11=(12-1)d

d=11/11

d=1

hope this helps

Answer 2

Answer:

n=12 d=-3

Step-by-step explanation: