Prime numbers + multiplication principle - examples
- No. of divisors
How many different divisors has number ??
How many rectangles with area 3032 cm2 whose sides is natural numbers are?
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?
How many different combinations of two-digit number divisible by 4 arises from the digits 3, 5 and 7?
- 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?