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The number of different seven-digit numb...

The number of different seven-digit numbers that can be written using only the three digits 1, 2, and 3 with the condition that the digit 2 occurs twice in each number is a. `^2P_5 2^5` b. `^7C_2 2^5` c. `^7C_2 5^2` d. none of these

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The correct Answer is:
`3^(7)-2^(7)-7.2^(6)`
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