How many integers between 0 and 10000 have one digit equal to 0? – InterviewSolution

1.

How many integers between 0 and 10000 have one digit equal to 0?

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So that's an AP

a=5

d=10

tn= 995

tn= a+ (n-1)d

995= 5 + (n-1)10

995= 5 + 10n-10

995= -5+10n

1000=10n

n= 100

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