Course Solutions Uncategorized (Solved) : Ask Friend Think Four Digit Decialnumber Abcd Reverse Like Deba Subtract One Taking Absolu Q34259942 . . . .

(Solved) : Ask Friend Think Four Digit Decialnumber Abcd Reverse Like Deba Subtract One Taking Absolu Q34259942 . . . .

June 27, 2024June 27, 2024| adminadmin| 0 Comment| 8:25 pm
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You ask your friend to think of a four-digit (decialnumber abcd, reverse it like deba, and subtract the one from the other (taking the absolute value of the difference). Then you ask him/her to leave out one of the non-zero digits of the difference, and calculate the sum of the remaining digits (of the difference). When your friend tells you this sum, you should be able to figure out the digit that was left out. How? Hint: A (decimal) number is divisible by 9 if and only if the sum of its digits is divisible by 9.

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