Mathlympics Qn: Number Theory – What is the last digitof the product 2 ^2010 x 9 ^2009?

31 Mar

 

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Try It:

If 2 ^ 3 = 2 x 2 x 2, and 9 ^ 3 = 9 x 9 x 9, what is the last digit

of the product 2 ^2010 x 9 ^2009?

Give us your answer and and your solution in the comments space below.

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