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3*28 =84
21*4= 84
28*3= 84
Its 84

The answer is 84

because, 3 x 28 = 84

28 x 3 = 84 and

21 x 4 = 84

because, 3 x 28 = 84

28 x 3 = 84 and

21 x 4 = 84