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To find sum of three numbers 16, 28 and 12, we can have two(a) We may first add 16 and 28 to get 44 and then add 12 to it to(b) We may add 28 and 12 to get 40 and then add 16 to get the sum 56.Thus, (16+ 28) +12 16+ (28+12)ways:get the total sum 56 ortetiuity of addition of

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