which of the following groups of number is arranged in decreasing order?
a.7 123; 7 281; 7 485; 7 735; 7 900
b. 10 962; 10 237; 10 780; 10 108; 10 276; 10 585
c. 15 856; 15 622; 15 546; 15 409; 15 376; 15 227
d. 20 789; 20 166; 20 497; 20 120; 20 000; 20 233