If x is a positive integer, is sqrt(x) < 2.5*x - 5 ?
1) x < 3
2) x is a prime number
How can OA be?
X is positive integer, sqrt(x) can still be negative.
1: if x>0 and x<3 then possible values 1,2 (0 is neither positive nor negative)
with both values sqrt(x) < 2.5*x - 5. hence sufficient.
2: x can be 2,3,5,7,11 .....
any value of x greater than 4 will result in sqrt(x) > 2.5*x - 5 hence insufficient.
Also sqrt of positive number is always +ve it can't be negative.