Subject
Quantitative Aptitude
Topic
Percentage
What percentage of numbers from 1 to 70 have 1 or 9 in the unit’s digit?
What percentage of numbers from 1 to 70 have 1 or 9 in the unit’s digit?
ক)
1খ)
14গ)
20ঘ)
21Explanation
Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69. Number of such number =14 So, Required percentage = (14/70 × 100)% = 20%Related questions
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