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By using the inverse function - inverse operations in the reverse order.

If you are asked to think of a number,

(A) multiply by 7, and

(B) add 5,

the person "reading your mind" will start with your answer and

(B-1) subtract 5, and

(A-1) divide by 7.

Sometimes some of these are built into the process so that the "quizzer" has less to do.

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Q: How does think of a number mind game works?
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