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Question

If 752742=75+x, then the value of x is equal to


A

74

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B

75

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C

76

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D

77

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Solution

The correct option is A

74


The given expression is

752742

752742=75+74

[Difference of the squares of two consecutive natural numbers is their sum]

Comparing them with

752742=75+x, we get

x=74


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