Respuesta :

Answer:

all 2-digit positive numbers divisible by 3: 12,15,18.21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99

sum= 1+2=3

1+5=6

1+8=9

3+9=12

6+9=15

9+9=18

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