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Aptitude School
Sunday, May 27, 2018
Ratio and Proportion
Ratio :
a/b or a : b
a → antecedent
b → consequent
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Saturday, May 26, 2018
Number System
Sum of Numbers:
Sum of
first n
natural numbers = n(n+1)/2
Sum of
square
of first n natural numbers = n(n+1)(2n+1)/6
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