∗025 will form a square of 95. Which digit should replace ∗?
A
9
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B
8
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C
7
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D
6
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Solution
The correct option is A9 Multiply ten's digit with its next number. 9×(9+1)=9×10=90−−−(1) Find the square of unit's digit: 5 52=25 ----(2) Combining (1) and (2), we get 9025=95×95 So, 9 is the missing number.