a). 22 + 44 + 66 + 88 = 220 ( suma nr pare )
b). 11 + 33 + 55 + 77 + 99 = 275 ( suma nr impare )
c). 16 , 61 , 25 , 52 , 34 , 43 , 70.
16 + 61 + 25 + 52 + 34 + 43 + 70 =301 ( suma )
d). 10, 11 , 12 , 21 , 20 , 30
10 + 11 + 12 + 21 + 20 + 30 = 104 ( suma )