Answered

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Sagot :

janmilczek

Answer:

5/16

Step-by-step explanation:

Each number can happen in exactly one way (one sets the digit of tens and the other of ones).

We know that the law of divisibility by 3 is "sum of digits has to be divisible by 3", so let's examine the numbers:

11

13

15 - Yes

17

31

33 - Yes

35

37

51 - Yes

53

55

57 - Yes

71

73

75 - Yes

77

So it's 5 out of 16 options.

We could do it by examining the relation and modulus shifts with each digit, but for 16 numbers it's seriously faster to just list them.

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