Find the wrong number in the following series?
1500, 1475, 1448, 1419, 1389, 1355, 1320

1475

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1419

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1389

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1355

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Solution

The correct option is C 1389
$1500 - 25 \Rightarrow 1475$
$1475 - 27 \Rightarrow 1448$
$1448 - 29 \Rightarrow 1419$
$1419 - 31 \Rightarrow 1388$
$1388 - 33 \Rightarrow 1355$
$1355 - 35 \Rightarrow 1320$
1389 is wrong one. It should be 1388.

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