find the Cardinal number of the following sets B={x:x is a two digit number, the sum of whose digits is 12}
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Answer:
x = { 39 , 48 , 57 , 66 , 75 , 84 , 93}
Cardinal Number n(B) = 7
Step-by-step explanation:
s B={x:x is a two digit number, the sum of whose digits is 12}
let say x = ab
& a + b = 12 0 ≤ a , b ≤ 9
a =3 b = 9
a = 4 b = 8
a = 5 b = 7
a = 6 b = 6
a = 7 b = 5
a =8 b = 4
a = 9 b = 3
x = 39 , 48 , 57 , 66 , 75 , 84 , 93
x = { 39 , 48 , 57 , 66 , 75 , 84 , 93}
Number of elements = 7
Cardinal Number n(B) = 7
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Good morning
There is only one way to write x as in this set 32 45 67 & 90
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