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Quantitative Aptitude

Divisibility Rule for Composite Numbers

100- Sum of f...

Question

100 - Sum of first 9 odd natural numbers = ___ .

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Solution

$S u m o f 1^{s t} n o d d n a t u r a l n u m b e r s = n^{2}; 100 - 9^{2} = 19$ .

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