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You can use the double fact 3 + 3 = 6 And then add 1 since 3 + 1 = 4 So 6 + 1 = 7

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(1) Answers

You can use the double fact 3 + 3 = 6 And then add 1 since 3 + 1 = 4 So 6 + 1 = 7

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