SOLUTION: find the cardinal number for each set B={1,3,5,...,21}

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Question 468011: find the cardinal number for each set
B={1,3,5,...,21}
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

find the cardinal number for the set

B={1,3,5,...,21}  |arithmetic sequence where d = 2

a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad

21=+1%2B%28n-1%29%2A2

   21 = 2n- 1

   22 = 2n

   11 = n, 21 is the 11th term, that is, this set has 11 terms 

  cardinal number for this set is 11