question_answer

The unit digit of\[1\times 6\times 66\times 666\times 555\times 999\]is

A)  1                                

B)  0           

C)  4                                

D)  5

Correct Answer: B

Solution :

 \[1\times 6\times 66\times 666\times 555\times 5\times 999\] \[1\times 6\times 6\times 6\times 5\times 5\times 9\] \[6\times 5\times 9\] \[9\times 0=0\]