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nth Term of A.P

5, 7, 20, 21,...

Question

5, 7, 20, 21, 80, 63, ?, 189

A

300

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B

305

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C

310

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D

315

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E

320

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Solution

The correct option is B 320
The given series consists of two series in alternate terms: namely
(i) 5, 20, 80, 320 and
(ii) 7, 21, 63, 189
Missing term belongs to series (i) which is $80 \times 4$ i.e. 320

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