write in the roaster form and its cardinal numbers .
C= { x/x is a multiple of 30 and 30<x<50}
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C = {x:x is a multiple of 30 and 30<x<50}
The multiples of 30 are 30,60,90,120,......
The roster form of the above set is
C = { }
Here set C is a null set because there no numbers between 30 and 50 which are multiples of 30.
Cardinal number is the number of elements in a set.
Here, set C is a null set. So, the number of elements of set C is 0.
The cardinal number of set C is 0.
I hope it is helpful.
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