Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**Hannibal lecter****Member**- Registered: 2016-02-11
- Posts: 392

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**Bob****Administrator**- Registered: 2010-06-20
- Posts: 10,464

hi Hannibal lecter

If you count 000, 001, 002, ... 999 that is 100 numbers. Won't take too long to try them all.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Sometimes I deliberately make mistakes, just to test you! …………….Bob

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**CurlyBracket****Member**- From: Your Maths Textbook
- Registered: 2022-01-03
- Posts: 151

Hi Hannibal Lecter,

I assume that the digits of the three rows are independent of one another, and only one combination can be used to unlock the lock.

Therefore we can treat it as a nine digit number.

Starting right from 000 000 000 upto 999 999 999, there are 10^9 different combinations.

Hope that helps!

Learning is fun - Exceptio probat regulam!

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