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  1. For what value of *, statement
    (*)
    		 ×
    (*)
    		 = 1 is correct ?
    21189
    1. 3969
    2. 147
    3. 63
    4. 21
Correct Option: C

Let ‘*’ be H

(H)
 ×
(H)
 = 1
21189

⇒  (H)2 = 21 × 189
⇒  H = √21 × 189 = 63


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