## Thinking Mathematically (6th Edition)

Given B={x|x belongs to N where 2 $\leq$ x &lt;7} From the given question. the given set represents the natural numbers which are greater than 2 but less than7 Those numbers are 2,3,4,5,6. The set contains 5 elements. The cardinal number for each set is formed by calculating the number of elements in each set. Therefore the cardinal number for given set B is n(B) = 5.