Question 104

Find the remainder when :
(1719 X 1721 X 1723 X 1725 X 1727) is divided by 18?

Solution

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R($$\ \frac{\ 1719*1721*1723*1725*1727}{18}$$) = R($$\frac{9\times\ 11\times\ 13\times\ 15\times\ 17\ }{18}$$) = 9

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