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DEBAJIT DAS

· started a discussion

· 1 Months ago

regarding this question (Question:827304.0)

i did not understand it

Question:

Pooja cleared the CGL and was called for a personal interview. The interview panel vetted her biodata and found that she was strong in her mathematical calculations. In order to test her they asked How many times ZERO(0) is written from 1 to 1000?. She replied 192. Again they asked How many times ZERO (0) is written one to one lakh? The panel was really amazed when she answered. What is the answer?

Options:
A)

58892 

B)

38894 

C)

28893

D)

48895

Solution:

To find out the number of zeroes apply the following: n(10n-1 + 1) - 10n - 1 /9 where ‘n’ is the number raised to the power of 10. As one lakh equals 105 substitute n = 5 to get the answer (i.e.) 38894. 

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