Pretty Properties

Let AA be the set of all two-digit integers for which the product of their digits is exactly twice as much as the sum of their digits.

Let BB be the set of all two-digit integers which become 75% greater when the digits are flipped.

Let nn be the number of two-digit integers in the union ABA \cup B.

Let xx be the only two-digit integer that is a member of the intersection ABA \cap B.

How much is n+xn + x?

×

Problem Loading...

Note Loading...

Set Loading...