perplexus.info :: Just Math : Find all possible values of x

Find all possible values of x (Posted on 2024-02-23)

Given that f(f(f(x)))=5.

It is known that:
f(x) = x/2, if x is even and
f(x) = x+1, if x is odd.

Find the possible values of x.

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

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solution

| Comment 1 of 2

Going backward through the levels

one step back:

two steps back:

20 9

three steps back:

40 19 18

so the answer is 18, 19, 40

Posted by Charlie on 2024-02-23 08:27:16

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