Question

3. - Find the cardinal number of the following sets: a. P = {x | x is a vowel in the word POISONOUS) b. Q = {x | x is a prime factor of 420) c. C = {x | x is an odd composite number less than 10) d. D = {x | x is a 3-digit number having the same digits}​

Answer 1

Answer:

(i) Factors of 12 are 1,2,3,4,6,12. So, the prime factors of 12 are 2,3.

    We write the set A in roster form as A={2,3} and hence n(A)=2.

(ii) B={x:x∈W,x≤5}. In Tabular form, B={0,1,2,3,4,5}. 

The set B has six elements and hence n(B)=6 

Answer 2

Answer:

In chemistry, the law of definite proportion, sometimes called Proust's law, or law of constant composition states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.