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If a and b are two integers divisible by 5, which of the following is not necessarily true?

Option 1)
a – b is divisible by 5
Option 2)
a² – b² is divisible by 25
Option 3)
a + b is divisible by 10
Option 4)
$a^{2}+b^{2}$ is divisible by 10
Option 5)
none of these

Answers (1)

best_answer

Let a=5 b=10

a+b=15 (not divisible by 10)

Not necessary to be true

Posted by

rishi.raj

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