Question

Write the cardinal number of A={x : x ∈ N and 3< x < 4}.

Answer 1

Answer:

(i) Set A = {2, 4, 5, 9, 15} has 5 elements.

Therefore, the cardinal number of set A = 5. So, it is denoted as n(A) = 5.

Step-by-step explanation:

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Answer 2

Answer:

${ \huge\fbox \pink {♥}\fbox \blue {A} \fbox\purple {N} \fbox \green{S} \fbox \red {W} \fbox \orange {E} \fbox{R} \fbox \gray{♥}}$

Step-by-step explanation:

1. Clearly n(M) = 6

2. P ={ 2, 5, 8, 11, 14 }

since P contains 5 elements n(P) = 5

3.Q = {243, 768, 1875 } since Q contains 3 elements n(Q) = 3

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

since R contains 10 elements n(R) = 10

5. S = { 1884, 1888, 1892, 1896, 1904} since S contains 5 elements n(S) = 5

I hope this answer helps you