Day 4: Magic

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Tell a friend to choose any number from 1 to 100, multiply it by 99, and add up the digits of his/her answer.

Now, you tell him/her the answer. Here is the secret: Suppose he/she has chosen the number 14.

14 x 99 = 1386

1 + 3 + 8 + 6 = 18

He/she may choose any number but the answer will always be 18.

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