Question

find the cardinal number R={x:x is an integers xez and -3 < x < 3}​

Answer 1

Given,

x ∈ Z and –5 ≤ x <5

So, x = -5 , -4 , -3 , -2 , -1 , 0 , 1 , 2 , 3 , 4

Set R = { -5 , -4 , -3 , -2 , -1 , 0 , 1 , 2 , 3 , 4 }

n(R ) = 10 .

Therefore, The cardinal number of the set R is 10

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