The greatest four digit number that can be formed by the digits 4, 5, 7, 9 (repetition of digits is allowed).

9754

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7954

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5974

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9999

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Solution

The correct option is D 9999
Given digits : 4, 5, 7, 9

We know that,
$9 > 7 > 5 > 4$

Since repeatation of digits is allowed, all the four digits will be 9.
Hence, the greatest four digit number formed will be 9999.

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How many 3-digit numbers can be formed from the digits 5, 6, 7, 8 and 9 assuming that

(i) Repetition of the digits is allowed?

(ii) Repetition of the digits is not allowed?

6, 7, 8, 9

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