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  4. The sum of all the numbers formed by using the digits 7, 8, 9 is

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Q. The sum of all the numbers formed by using the digits 7, 8, 9 is

Permutations and Combinations

Solution:

Reqd. sum $= \left(7+8+9\right)\times2!\times\left(111\right)$
$=48\times111=5328$