Pick a two - digit number . Multiply the digit together . Continue until you get a single digit . What is the only two digit number that would require more than three multiplication .
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I am not sure, but is it 77 ?
As you can see first result is 7*7 = 49
Second result = 4*9 =36
Third result = 3*6 = 18
Fourth result = 1*8 = 8.
As you can see first result is 7*7 = 49
Second result = 4*9 =36
Third result = 3*6 = 18
Fourth result = 1*8 = 8.
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