Sets - Definition of terminology

         

If set SS has S=3|S|=3 elements and satisfies (i)  0S and(ii)  if pS,qS and pq, then (p+q)S\begin{aligned} \text{(i)} &\; 0 \in S \text{ and} \\ \text{(ii)} &\; \text{if } p \in S, q \in S \text{ and } p \neq q, \text{ then } (p+q) \in S \end{aligned} and 1010 is an element of S,S, what is the other element of SS excluding 00 and 10?10?

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If AA is the set of all odd positive integers less than 50,50, what is the number of elements in A?A?

If AA is the set of all integers satisfying 11x27,11 \leq x \leq 27, what is the number of elements in A?A?

If AA is the set

A={13,17,9,0,13}, A= \{13, 17, 9, 0, -13\},

what is A?\lvert A \rvert?

Details and assumptions

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How many elements are in the set {10,12,14,,48,50}\{10, 12, 14, \ldots, 48, 50\}?

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