3)Cati multipli de 31 sunt cuprinsi intre 1200 si 2016?
31×39=1209
31×40=1240
31×41=1271
31×42=1302..............
...........
31×65=2015 ultimul multiplu de 31 aflat in inttervalul dorit
deci sunt 27 de multipli
65-39+1=27
1209, 1240, 1271, 1302, 1333, 1364, 1395, 1426, 1457, 1488
1519, 1550, 1581, 1612, 1643, 1674, 1705, 1736, 1767, 1798
1829, 1860, 1891, 1922, 1953, 1984, 2015