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We want irrational number and not rational number.

7/2 = 3.5 and 2/5 = 0.4

between 0.4 and 3.5

square 0.4 and 3.5 => 0.16 and 12.25

take any number between them which is not a perfect square.

2, 3, 5 , 7, 8, 6, 10, 11, 12

so

√2, √3, √5 , √7, √6, √8, √10, √11, √12 are all irrational numbers between 7/2 and 2/5.

7/2 = 3.5 and 2/5 = 0.4

between 0.4 and 3.5

square 0.4 and 3.5 => 0.16 and 12.25

take any number between them which is not a perfect square.

2, 3, 5 , 7, 8, 6, 10, 11, 12

so

√2, √3, √5 , √7, √6, √8, √10, √11, √12 are all irrational numbers between 7/2 and 2/5.