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If (74)^2 is subtracted from the square of a number, the answer so obtained is 5340. What is the number? (a) 98 (b) 102 (c) 104

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If (74)2 is subtracted from the square of a number, the answer so obtained is 5340. What is the number? 

(a) 98 (b) 102 (c) 104 (d) 110 (e) None of these

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(c) Let the number be x.
Then,
x2 – (74)2 = 5340
x2 = 5340 + 5476
= 10816
x = √10816 = 104

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