17 odd numbers.
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5 of them.The least common multiple of 12 and 18 is 36. Further common multiples include 72, 108, 144, 180, and 216. Thus, there are five numbers less than 215 that are divisible by both 12 and 18.There are five numbers: 36, 72, 108, 144, 180.
It is 83667.
The LCM of two numbers will never be less than the GCF.
All but the square numbers - 53 of them.
There are 14 whole numbers in that range divisible by 7. There are 19 whole numbers in that range with a 7 in their digits. Three overlap so there is a total of 30 whole numbers with either characteristic.