Q: How many numbers are there between 200 and 500 that have 7 in the tens place?

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Ten of them.

70

There are infinitely many such numbers. For example, 123,456,063

Only one number between 0 and 60 has a two in the ones and tens place, and it's 22. However, if you are looking for all the numbers between 0 and 60 that have a two in EITHER the ones OR tens place, they are 2, 12, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 42, and 52.

300

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40 integers (whole numbers), an infinite number of decimal numbers.

Ten of them.

70

ten

There are infinitely many such numbers. For example, 123,456,063

two. 70 and 170.

20

Only one number between 0 and 60 has a two in the ones and tens place, and it's 22. However, if you are looking for all the numbers between 0 and 60 that have a two in EITHER the ones OR tens place, they are 2, 12, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 42, and 52.

There are infinitely many such numbers. One is 4568231432.756

300

38

There is one six in the units place every 10 numbers. So from 1 to 1000 there are 100 6s in the units place. There are ten sixes in the tens place every 100 numbers, so from 1 to 1000 there are 100 6s in the tens place. Finally, there are 100 numbers that have 6 in the hundreds place. Add all these together, and you get 300. Thus there are 300 6s between 1 and 1,000.