Write the greatest and the smallest $7$ -digit number, using the digits
(1) $4, 3, 7, 8, 6 a n d 2$

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Solution

The formula to find the greatest number is to arrange all elements in the descending order
And the formula to find the smallest number is to arrange all elements in the ascending order.
So greatest number = $8876432$
Smallest number = $2234678$

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