Răspuns :
restul poate fi 0 , 1 , 2, si 3
a : 4 = 39 rest 0
a = 4 x 39
a = 156
a : 4 = 39 rest 1
a = 4 x 39 + 1
a = 157
a : 4 = 39 rest 2
a = 4 x 39 + 2
a = 158
a : 4 = 39 rest 3
a = 4 x 39 + 3
a = 459
a : 4 = 39 rest 0
a = 4 x 39
a = 156
a : 4 = 39 rest 1
a = 4 x 39 + 1
a = 157
a : 4 = 39 rest 2
a = 4 x 39 + 2
a = 158
a : 4 = 39 rest 3
a = 4 x 39 + 3
a = 459