1. Use the given digits without repetition and make the greatest and smallest 4-digit numbers.

(a) \; 2, 8, 7, 4 \; \; \; (b)\; 9, 7, 4, 1 \; \; \; (c) \; 4, 7, 5, 0 \; \; \; (d)\; 1, 7, 6, 2\; \; \; (e)\; 5, 4, 0, 3

(Hint : 0754 is a 3-digit number.)

Answers (1)

(a) 2, 8, 7, 4

 8742 is the greatest while 2478 is the smallest

(b) 9, 7, 4, 1

 9741 is the greatest 1479 while is the smallest

(c) 4, 7, 5, 0

 4750 is the greatest while 4057 is the smallest

(d) 1, 7, 6, 2

7621  is the greatest while 1267 is the smallest

(e) 5, 4, 0, 3

5430 is the greatest while 3045 is the smallest 

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