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Let A = {1, 2, 3, 4, 5, 6} and * be an operation A defined by a * b = r, where r is the least non-negative remainder when the product

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Let A = {1, 2, 3, 4, 5, 6} and * be an operation A defined by a * b = r, where r is the least non-negative remainder when the product ab is divided by k. Operation * is binary operation if k = 

(A) 7 

(B) 11 

(C) 21 

(D) 17 

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Correct Option :- (A) 7

Explanation :-

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