How often does 7 occur from number 1 to 1000?
8,719
Consider the number of times $7$ appears (a) as the units digit, (b) as the tens digit, (c) as the hundreds digit and add them together.
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Author by
user301837
Updated on January 02, 2020Comments
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user301837 almost 4 years
How many times will the digit $7$ be written when listing the integers from $1$ to $1000$?
Is the following method correct?
For a single $7$,
$($C(1,1)$ \times$C(9,1)$\times$C(9,1)$)$$\times$3!
etc...
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Empy2 almost 8 yearsAnswer it from 1 to 10; from 1 to 100.
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Empy2 almost 8 yearsWrite numbers down to see how many 7s you will get
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