120
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20 is the answer because 6!/(6-3)!3!=6 times 5 times 4/3 times 2 times 1=20
5/6 x 24 = 5/6 x 24/1 Note the use of the trivial '1' to make it 'multiplication of fractions'. Since '6' & '24' have a common factor of '6' cancel down (reduce) by '6' Hence 5/1 x 4/1= 20/1 Remove the trivial '1' . hence the answer ids '20'.
10 times for the one's digit, 1-100 10 times for the ten's digit, 60-70 = 20 times
6 times what = 78
180/20=99*20=180