GATE CS 2017 Set 2 — Question 63
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General Aptitude → Quantitative Aptitude → Ratios, Percentages, Powers, Exponents & Logarithms
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Question
is a 30 digit number starting with the digit 4 followed by the digit 7. Then the number will have
Correct answer
(A) 90 digits
Solution
is a 30-digit number starting with 47. Thus, .
Taking the cube of the boundaries:
A number has digits if . Since , the number of digits in is exactly .
Taking the cube of the boundaries:
A number has digits if . Since , the number of digits in is exactly .
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