fedik0033
Это на английском? напиши на русском я вроде в математике разбираюсь!
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Abdu3130
Сколько 2х значных чисел не деляться на 13
meikochan
Two-digit numbers start from 10 and go up to 99, so there's 89 two-digit numbers. if you'd try to figure out how many of them ARE divisible by 13, you'd get a 7. so 89-7=82
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if you'd try to figure out how many of them ARE divisible by 13, you'd get a 7.
so 89-7=82