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12, 27, 85, 345, ?

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12, 27, 85, 345, ?
A. 1737
B. 1380
C. 1725
D. 1731
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1 Answer

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Correct Answer - D
`12xx2+3=27`
`27xx3+4=85`
`85xx4+5=345`
`345xx5+6=1731`
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