5, 6 and 7 are three consecutive numbers.
5+6+7=18, which is divisible by 3.
when you add any three consecutive number, total is divisible by 3.
a) is this always, sometimes, never true?
b) what if you add four cosnecutive number?
bn nào thông minh giúp mk nhé mk tặng 1 lik-e