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Q. The last digit of $2015!+3^{2015}$ is

NTA AbhyasNTA Abhyas 2022

Solution:

Last digit of $2015!$ is zero.
Now, $3^{2015}=3\left(3^{2014}\right)= \, 3. \, 9^{1007}=3\left(10 - 1\right)^{1007}$
Hence, last digit is $7$ .