Twenty, 7, 17, 27, 37, 47, 57, 67, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 87, 97. DONT FORGET, 77 HAS TWO.
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7,17,27,37,47,57,67,70,71,72,73,74,75,76,77(two sevens),78,79,87,97=20 times
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what is the unit digit of the product if hundred 7"s r multiplied
If you mean: 4(2s-1) = 7s+12 then the value of s works out as 16
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