a question about remainder

What is the remainder when 7^(4n+3) 6^n is devided by 10

Pl clarify in detail :-
(x) denotes the least integer greater or equal to x,(2x)=?

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2^#

sandyzeng发表于 2005-4-12 15:06 | 只看该作者

Do you have any restrictions on n?
integer, positive, negative...

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3^#

elitist发表于 2005-4-12 23:03 | 只看该作者

7^1 = 7 7^2 = 49 7^3 = 343 7^4 = 2401 7^5 = 16807 If you see the patten , the numbers are pepeating after every 4 th power. So remainer is 3.

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