Question

in an AP the first term is 22,n th term is -11 and sum of the first n terms is 66. find n and d.

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

Using formula = sum =n/2(a+an)

66=n/2(22-11)

132=11n

n=12

Now,an=a+(n-1)d

-11=22(12-1)d

-33=11d

d=-3

HOPE YOU WILL GET!!