Problem 293
Decide whether the following statements are true or false and justify your answer:
a. If n(A) < n(B), then A 
B.
b. If n(A) 
n(B) , then A 
B.
c. If A B, then n(A)< n(B).
d. If A B, then n(A) n(B).
Solution
a. False, elements are not same in both sets.
b. False , not equal or equivalent
c. True , equal or equivalent
d. True , equal or equivalent