Characteristics of multiples of 3: the sum of numbers is multiples of 3;
Characteristics of multiples of 5: each bit is an integer of 0 or 5;
The characteristic of being a multiple of 2, 3 and 5 at the same time: the unit bit is 0, and the sum of numbers is a multiple of 3.
For example, 30, 60 and 90 are all multiples of 2, 3 and 5.
1, and every bit is 0: because 2*5= 10, this number must be a multiple of 10, so every bit is 0.
2. All numbers add up to multiples of 3: Because numbers that are multiples of 3 have a characteristic, all numbers add up to multiples of 3.
3 is a multiple of 30: because 2 * 3 * 5 = 30, this number must be a multiple of 30.
The minimum quantity is 30.