Make the smallest and greatest 4-digit numbers using any 4 different digits with the conditions given- a] 4 at tens place   b] 9 at hundreds place    c]7 at ones place    d] 1 at thousnd place

Dear Student,

(a) 4 at 10 s place.  
smallest: 1041  greatest : 9847

(b) 9 at hundreds plcase

smallest: 1902   greatest: 8976

(c) 7 at 1s place

smallest: 1027    greatest: 9867

(d) 1 at thousands place

smallest: 1023  greatest : 9867

Regards.