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The reason why this works so well is because of this
every number multiplied by nine will give you a two digit number whos digits ADD to nine
1x9 = 9 and 9+0 = 9
5x9 = 45 and 4+5 = 9
8x9 = 72 and 7+2 = 9
that means that theyve already tricked you into getting "d" for your letter because no matter which number you choose the answer will be the same.