The total number of digits used in numbering the pages of a book having 350 pages is
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Step-by-step explanation:
do AP for n terms in 3cases
FOR for 1 digit no , 2 digit no till 99 and and 3 digit no till 350 and add all of them .
You will get an1 +an2+an3 is answer . I gave you hint only .try it with help of arthematic progression
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