Prime numbers + multiplication principle - examples

  1. No. of divisors
    triangle_div How many different divisors has number ??
  2. Rectangles
    rectangles How many rectangles with area 3032 cm2 whose sides is natural numbers are?
  3. Stacks
    euro_stacks Annie has a total of $ 702. The money must be divided into stacks so that each buyer has the same amounth of dollars. How many options she have?
  4. Combinations
    circles How many different combinations of two-digit number divisible by 4 arises from the digits 3, 5 and 7?
  5. Inverted nine
    In the hotel,, Inverted nine" each hotel room number is divisible by 6. How many rooms we can count with three-digit number registered by digits 1,8,7,4,9?

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