1500 1581 1664 1749 1833 1925 2016

1581

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1664

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1833

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1925

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1749

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Solution

The correct option is C 1833
$1400 + (10)^{2} = 1500$
$1500 + (9)^{2} = 1581$
$1600 + (8)^{2} = 1664$
$1700 + (7)^{2} = 1749$
$1800 + (6)^{2} = 1833 (1836)$
$1900 + (5)^{2} = 1925$
$2000 + (4)^{2} = 2016$
$∵$ Wrong number = 1833
$∴$ Right number $= 1800 + (6)^{2} = 1836$

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