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Question
Find the indicated term in the following sequence whose nth term is:
`a_n = (n(n-2))/(n+3)` ;`a_20`
Sum
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Solution
an = `("n"("n" - 2))/("n" + 3)`
Put n = 20,
a20 = `(20(20 - 2))/(20 + 3)`
a20 = `(20 xx 18)/23`
= `360/23`
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