Question

For an A.P. a = 2 and d = 4 then find tn​

Answer 1

Answer:

Answer

In AP , given that a=−2 and d=4

Given that the sum of first n terms in the series is S

n

=160

We know that the sum of first n terms in the series is S

n

=

2

n

(2a+(n−1)d)

⇒

2

n

(2a+(n−1)d)=160

⇒

2

n

(−4+4(n−1))=160

⇒n(n−2)=80

⇒n=10,−8

Since n is positive integer , the value of n=10

Step-by-step explanation:

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