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3 years ago

Pages in a book are numbered from 1 to 1001. How many of these page numbers include the digit 7?

Mathematics

2 answers:

Pie3 years ago

6 0

Answer:

100

Step-by-step explanation:

one digit number=7 (1 page)

two digit numbers=17,27,37,47,67,77,87,97(9)

three digit numbers=

107,117,127,137,147,157,167,177,187,197 (10)

207,217,.................................,277,287,297 (10)

307,317,..................................,377,387,397 (10)

404,..........................................477,487,497 (10)

507,...................................................................(10)

607,....................................................................(10)

707,717,727,737,747,757,767,777,787,797 (10)

807,..............................................................,897 (10)

907,..............................................................,997 (10)

total number of pages=1+9+9(10)=10+90=100

Brilliant_brown [7]3 years ago

6 0

Answer:

Hello :)

Step-by-step explanation:

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Step-by-step explanation:

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2 years ago

Talia attended a 555-day math camp that lasted \dfrac56

Vaselesa [24]

Complete Question

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Answer:

4 1/6 hours

Step-by-step explanation:

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3 years ago

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Step-by-step explanation:

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3 years ago

I dont know how to do this one

-BARSIC- [3]

Answer:

$2\sqrt{34}$

Step-by-step explanation:

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hope this helped! :)

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2 years ago

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denis23 [38]

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Step-by-step explanation:

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3 years ago