Lessons

General Aptitude
5.1 Percentage - General Questions

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Q.

What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?

View Answer

Correct choice: C

Explanation:

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
Required percentage =(14/70)×100% = 20 %

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