Five.
5 x 1.20 = 6
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6 X 4 = 24 toilet rolls in 6 packs.
120 ÷ 6 = 20
It is 1 - pr(no 5 nor 6 in 120 rolls) = 1 - (2/3)120 = 1 - 1.113*1057 which is so close to 1 as to make no difference. It is 0.99...98887 which starts off with a string of 56 nines.
To determine how many times 20 goes into 120, you would divide 120 by 20. The result is 6, meaning that 20 goes into 120 exactly 6 times. This can be calculated by dividing the dividend (120) by the divisor (20) to get the quotient (6).
720 ÷ 6 = 120