@mathprobs 115)I turn on both sides of 1rope & inthesametime side of the other rope.1st rope take half h to burn,nowlast side: 2nd take 15' 1 month ago
@mathprobs 114) Divided for 2 the possibility. Ex: I ask for higher or lower 50, then 25, then, 12, 6, 3...7 step and I find out the number! 1 month ago
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