Write the following set in the tabular form and find their cardinal numbers $.$
$B = {x : x$ is a two digit number divisible by $15$ $}$

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Solution

The tabular form or Roster form of the given set $B = {x : x$ is a two digit number divisible by $15$ $}$ can be given as below
In the given set $x$ is a two digit number which is divisible by $15$ $.$
The numbers $15, 30, 45, 60, 75, 90$ are two digit number divisible by $15$
$B = \{15, 30, 45, 60, 75, 90\}$
Cardinal number of the set $B$ is the number of elements in it $.$ It is denoted by $n (B)$
$n (B)$ $= 6$
Hence $,$ tabular form of given set is $B = \{15, 30, 45, 60, 75, 90\}$ and cardinal number is $6$

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