Subject: General Aptitude · Chapter: Square Roots and Cube Roots · Exam: 2006 · Marks: · Difficulty:
What percentage of the numbers from 1 to 50 have squares that end in the digit 1?
(a)1
(b)5
(c)10
(d)11
(e)20
Answer
Answer (as printed): E
Explanation
The squares of numbers having 1 and 9 as the unit's digit end in the digit 1. Such numbers are: 1, 9, 11, 19, 21, 29, 31, 39, 41, 49 i.e., there are 10 such numbers.
Explanation as extracted from the printed page; notation may be imperfect.