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Permutation

The number of...

Question

The number of unsuccessful attempts that can be made by a thief to open a number lock having 3 rings in which each ring contains 6 numbers is

A

205

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B

200

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C

210

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D

215

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Solution

The correct option is D 215
Total - $1 = 6 \times 6 \times 6 - 1$

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