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Find the middle term(s) of an A.P. 9, 15...

Find the middle term(s) of an A.P. `9, 15, 21, 27,…, 183`

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The correct Answer is:
`4x^(2)(x-1)`
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SURA PUBLICATION-SURAS MODEL QUESTION PAPER-2019-Part-III
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  5. Find the middle term(s) of an A.P. 9, 15, 21, 27,…, 183

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