3 years ago

33. A competition question requests students to form a three-digit number.

1 answer:

7 0

Answer:

532

Step-by-step explanation:

532 = 2·2·7·19

There are 24 possible 3-digit numbers from the set {2, 3, 5, 7}. Of those, 6 have four factors: 372, 375, 532, 572, 732, 735.

The sums of factors of these numbers are ...

38, 18, 30, 28, 68, 22

The number of interest is 532.

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