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Q.

Which of the number is square root of 5625?

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a

65

b

75

c

85

d

45

answer is B.

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Detailed Solution

If a number with unit digit 5, i.e., a5, then square of that number is = a (a + 1) hundred + 25

So, here 752= (7 × 8) hundreds + 25 = 5625

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