A letter lock consists of 4 rings, each ring contains 9 non-zero digits. This lock can be opened by setting a 4 digit code with the proper combination of each of the 4 rings, Maximum how many codes can be formed to open to open the lock

4^{9}

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^{9} P_{4}

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9^{4}

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none of these

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Solution

The correct option is C $9^{4}$
$9 \times 9 \times 9 \times 9 \times = 9^{4}$ .

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A letter lock consists of 4 rings, each ring contains 9 non-zero digits. This lock can be opened by setting a 4 digit code with the proper combination of each of the 4 rings, Maximum how many codes can be formed to open to open the lock

The correct option is C 949×9×9×9×=94.

The correct option is C $9^{4}$
$9 \times 9 \times 9 \times 9 \times = 9^{4}$ .