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Q.

[[1]] is the greatest 4-digit number that will be formed by using 1, 4, and 9 (any one digit can be used twice).

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answer is 9941.

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Detailed Solution

The given digits are 1, 4 and 9.

To obtain the greatest number, arrange the digits in descending order, 9 > 4 > 1.

Any greatest 4-digit number from the given digits can be formed by using the biggest digit at the thousands place and the smallest digit at ones place.

And the greatest digit will be used twice to form the greatest number.

So, the greatest number is 9941.

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[[1]] is the greatest 4-digit number that will be formed by using 1, 4, and 9 (any one digit can be used twice).