Q. 3.     Make the greatest and the smallest 4-digit numbers using any four different digits with conditions              as given. (Note, the number cannot begin with the digit 0. Why?)

             (b) Digit 4 is always at tens place               Greatest  

                                                                                 Smallest


            (c) Digit 9 is always at hundreds place       Greatest

                                                                                Smallest



           (d) Digit 1 is always at thousands place       Greatest

                                                                                Smallest
 

            

Answers (1)

(b) Digit 4 is always at tens place 
                  Greatest - 9847
                  Smallest - 1042


(c) Digit 9 is always at hundreds place  
                   Greatest - 8976
                   Smallest - 1902 


(d) Digit 1 is always at thousands place 
                    Greatest- 1987
                    Smallest - 1023

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