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Providing of course that a sample is representative of the population from which it is drawn, the bigger it is the more likely it will be to lead to a valid conclusion. Therefore, the best sample size when there are no restrictions, as in this case, would be one of 1000.
No points can be drawn from a point.
1/21
One out of four.
It can be only 1 * * * * * Infinitely many concentric circles can be drawn.