Question 990406
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1.  The number of elements in the sequence 


16, 18, 20, 22, . . . , 50


(arithmetic progression with the first term  16  and the common difference  2)  is 


n = {{{(50-16)/2 + 1}}} = {{{34/2 + 1}}} = {{{17+1}}} = 18 


(cardinality).



2. And I am confused with yours second sequence.

Is it identical to the first one?