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Which of the following is not an irrational number #5sqrt5#, #sqrt2#, #4sqrt4#, #4sqrt16#?

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Apr 13, 2015

Both #sqrt(4)# and #sqrt(16# can be written as rational values
#sqrt(4) = 2#
and
#sqrt(16) = 4#
So both #4sqrt(4)# and #4sqrt(16)# are rational.

#5sqrt(5)# and #sqrt(2)# are both irrational.

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