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  1. Which number should replace both the asterisks in (* /21) x (*/189) = 1 ?
    1. 21
    2. 63
    3. 3969
    4. 147
Correct Option: B

Let (y/21) x (y/189) = 1
Then , y2 = 21 x 189 = 21 x 21 x 9
∴ y = (21 x 3) = 63 .


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