If m and n are integers divisible by 5, which of the following is not necessarily true?
option
a) (m - n) is divisible by 5.
b) (m^2 - n^2) is divisible by 25
c) (m + n) is divisible by 10
d) None of these

• Option (c) will be the answer because if we put m=5 and n=20 in option (c)
  
  then we will get m+n=25 which is not divisible by 10
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• ans: c
  for ex 10 and 15 both are divisible by 5
  but 10+15=25 is not divisible by 10
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• c because let take a case of 10 and 5 then 10 + 5 = 15 is not divisible by 10
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