Answer :

He did 3+5+7+9+3! to solve it.
By using the factorial sign ! .

3 + 5 + 7 + 9 + 3! = 30 .

3! means = 1 * 2 * 3 = 6

So he concluded that

3 + 5 + 7 + 9 + 6 = 30.

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