exam Maths Puzzle Numerical Ability

what is the number 0 classified as there are many many classifications for the number 0 but I don't know all of them.

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exam Other Question

Suppose four cards are drawn from a deck of cards. In how many ways can four aces be drawn? If the base of a rectangle is 23.4 mm and the are is 439.92 mm2, what is the height of the rectangle