If m and n are integers divisible by 5, which of the following is not necessarily true? · ABC26GN0266
Subject: General Aptitude · Chapter: Number System
If m and n are integers divisible by 5, which of the following is not necessarily true?
(a)m + n is divisible by 10
(b)m – n is divisible by 5
(c)$m^2 - n^2$ is divisible by 25
(d)None of these
Answer
Answer (as printed): A
Explanation
Take m = 15 and n = 20. Then, each one of m and n is divisible by 5. But, (m + n) is not divisible by 10. Hence, (m + n) is divisible by 10 is not true.
Explanation as extracted from the printed page; notation may be imperfect.