Question

What is the 20^th term of sequence defined by an = (n-1)(2-n)(3+n)​

Answer 1

Answer:

It is not an AP

Step-by-step explanation:

In the given AP if we substitute

n = 1 then a1 = 0

n = 2 then a2 = 0

n = 3 then a3 = - 12

for any AP difference between any two consecutive terms must be either zero ( 0 ) or non zero and it is uniform throughout.

But in this case

d = a2 - a1 = 0

d = a3 - a2 = -12

Therefore we are getting two different differences

So given is not an AP

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