how many times does the digit 9 occur in the units place in the natural numbers up to 100
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Between 1 and 100, the digit 9 occurs in 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98 and 99. ∴ The digit occurs 20 times between 1 and 100.
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There 10 nines at the unit place in the natural number upto 100.
They are : 9 , 19 , 29 , 39 , 49 , 59 , 69 , 79 ,89 , 99 .
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