If a and b are two integers such that a is even, b is odd and neither of them leaves a remainder of 1 when divided by 10

[BTGmoderatorDC]

If a and b are two integers such that a is even, b is odd and neither of them leaves a remainder of 1 when divided by 10, what is the units digit of a × b?

(1) The units digit of a^3 is the same as the units digit of a.

(2) The units digit of b^4 is the same as the units digit of b.


OA B

Source: Veritas Prep

[swerve]

If a and b are two integers such that a is even, b is odd and neither of them leaves a remainder of 1 when divided by 10, what is the units digit of a × b?

(1) The units digit of a^3 is the same as the units digit of a.

(2) The units digit of b^4 is the same as the units digit of b.


OA B

Source: Veritas Prep

Statement 1:

\(a =\) Even and units digit of \(a^3\) is same as \(a\)

So, \(a\) can take the following values -

\(a = \{4, 6\}\) Not Sufficient \(\Large{\color{red}\chi}\)

Statement 2:

\(b =\) Odd and units digit of \(b^4\) is same as \(b\) and \(b\) is not \(1\)

So, \(b\) can take the following values -

\(b = \{ 5 \}\) Sufficient \(\Large{\color{green}\checkmark}\)

Therefore, B