Find the indicated terms in each of the sequences in Exercises 7 to 10 whose n th terms are : a n = n 2 2 n ; a 7

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Solution

The n th term of the sequence is given as,

a n = n( n−2 ) n+3 (1)

Substitute n=20 in equation (1),

a 20 = 20( 20−2 ) 20+3 = 20( 18 ) 23 = 360 23

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