If
, what is the last digit of $($4$)$?
8
6
4
2
1
OA:
Based on the formula, the value of $4$ is
which is
or
.
However, in
the numerator will be a large number with the last digit being 4 - you can get it just multiplying
and getting 4 as a last digit for every
returns 4 as a last digit. So, 4 divided by 2 is 2.
The correct answer is D.
End of OA.
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My problem is that when the OA says "
returns 4 as a last digit. So, 4 divided by 2 is 2" it assumes that the last digit of a quotient is the last digit of the division between the last digits of the numerator and the denominator which is not always true... in this example it worked since 64/2=32 and 4/2=2... but what about 14/2?? The result is 7, not 2....
I don't think that's relevant. In this question, you are specifically asked for the last digit of $($4$)$.