Which of the following is rational (a)√5 (b)π (c) (√2 )(√3 ) (d) √225
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a) √5 is irrational number as it does not form a perfect square
b) π is irrational (but 22/7 is rational)
c) (√2 )(√3) = √5 which is irrational
d) √225 =15 is rational number as it forms a perfect square
So option d is correct
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