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Find the indicated terms of the sequenc...

Find the indicated terms of the sequence whose `n^(t h)`terms are : `a_n=(n(n-2))/(n+3)`; `a_(20)`

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The correct Answer is:
N/a
`because" nth term of given sequence "a_(n)=(n(n-2))/(n+3)`
`therefore" At n = 20,"`
`a_(20)=(20(20-2))/(20+3)=(20xx18)/(23)=(360)/(23),`
`therefore" "a_(20)=(360)/(23)`
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