Elements

Q. If the set A is defined as A = {x : x is a factor of 42 and is a prime number}. Then the number of elements in set A is ____ .

1. 3

Q.

The cardinal number of $A=\left\{\right(x:x=5n,n\in W,n<4\}$ is ___.

1. 2

2. 4

3. 5

4. 3

Q.

Question 9:

Write the natural numbers from 102 to 113. What fraction of them are prime numbers?

Q. If X = { 1, 3, 5, 7}, then n(X) = _________.

1. 2
2. 1
3. 4
4. 3

Q. Given : P = {2, 4, 6, 8, 10, 12, 14, 16}. What can be said about the elements of the set P?

1. All elements are even numbers.
2. The elements form an odd number series
3. The elements of P are at irregular intervals.
4. All elements are Prime numbers.

Q. The number of elements in the set {x : x is a letter of the word 'MISSISSIPPI'}, is ____ .

1. 4

Q. The cardinal number of $A=\left\{\right(x:x=5n,n\in W,n<4\}$ is ___.$\left[2Marks\right]$

Q. ntTwo finite sets A and B have respectively p and q elements .if trhe total number of subsets in A is 56 more than the total no of subsets of B , then find the values of p and q .n

Q. Which of the following is the most abundant element in the universe?

1. Hydrogen
2. Iron
3. Oxygen
4. Helium

Q.

Write the cardinal number for the set $A=\left\{s,d,f,g,h,j,k,l,z,x,c,m\right\}$.

Q. If $a=-11/27,b=4/9$ and $c=-5/18$, then verify that $a+(b+c)=(a+b)+c$.