Using the tn formula, t1=56, the last number, tn=497, and d=7. Therefore, 497=56+(n-1)7. 448=7n, and n=64. So there are 64 numbers between 50 and 500 that are divisible by 7.
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There are 232 numbers between 1 and 500 that are divisible by 3 or 5.
There are 43 natural numbers between 200 and 500 that are divisible by seven.
Exclusively, meaning not including 200 and 500, there are 149 even (divisible by two) numbers between 200 and 500.
29 of them.
Not sure!