7. What is the 20 term of the sequence defined by a = (n-1)(2-n)(3 + n)?

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7. What is the 20 term of the sequence defined by a = (n-1)(2-n)(3 + n)?

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Answer: 7866Step-by-step explanation:We need to find 20th term i.e.

a20 Let an = (n-1) (2-n) (3 + n) putting n = 20 in (1) a20 = (20-1) (2-20) (3 + 20) = (19) ( 18) (23) = 7866.

Hence the 20th term is 7866.