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positive square numbers less than 50 are 7 these are : 1,4,9,16,25,36,49.These are less than 50.
130 numbers
It is positive. Any product of an even number of negative numbers will be positive, regardless of how many positive numbers you have. Similarly any product of an odd number of negative numbers will be negative, regardless of how many positive numbers you have.
There are 25 prime numbers less than 100
There are 46 prime numbers less than 200.