The set of numbers which are the multiples of 5 is:
(A) a finite set (B) an infinite set (C) a singleton set (D) none of these.
2. Range of data : 20 , 40 , 30 , 60 , 80 , 100 , 10 , 70 is :
(A) 10 (B) 100 (C) 90 (D) none of these.
3. The nth
term of an A.P. is given by an = 3+4n . The common difference is :
(A) 7 (B) 3 (C) 4 (D) 1.
4. A set has 4 elements , then total number of subsets is :
(A) 4 (B) 14 (C) 16 (D) none of these.
5. Sum of series : 1+2+3+ …………………… + n is
()
(+1)
2
() ( + 1) ()
(+1)(+2)
2
() none of these.
6. Coefficient of Variation is …………….
7. Roster form of the set {x: x is an integer and -3 < x < 7} is …………….
8. Geometric Mean between two positive real numbers a and b is ……….
Answers
Step-by-step explanation:
Q1The set of numbers which are the multiples of 5 is:
(A) a finite set (B) an infinite set (C) a singleton set (D) none of these.
Sol: Set of numbers which are multiples
of 5 {5,10,15,20,25,30...} is an infinite set
Option B is correct
2. Range of data : 20 , 40 , 30 , 60 , 80 , 100 , 10 , 70 is :
(A) 10 (B) 100 (C) 90 (D) none of these.
Sol: Range = Maximum data-Minimum dataRange=100-10= 90
option C is correct.
3. The nth term of an A.P. is given by an = 3+4n . The common difference is :
(A) 7 (B) 3 (C) 4 (D) 1.
Sol: First term a1=3+4×1=7
Second term a2=3+4×2=3+8=11
Common difference: a2-a1
d = 11-7
d =4
Option C is correct.
4. A set has 4 elements , then total number of subsets is :
(A) 4 (B) 14 (C) 16 (D) none of these.
Sol: If a set have n Elements,then it have 2^n subsets.So,here no. of subsets 2^4=16
Option C is correct.
5. Sum of series : 1+2+3+ …………………… + n is
()
(+1)
2
() ( + 1) ()
(+1)(+2)
2
() none of these.
Sol: Sum of natural numbers up to n terms
6. Coefficient of Variation is …………….
Sol: Coefficient of Variation= Standard deviation/Mean
7. Roster form of the set {x: x is an integer and -3 < x < 7} is …………….
Sol: A:{-2,-1,0,1,2,3,4,5,6}
8. Geometric Mean between two positive real numbers a and b is ……….
Sol: GM=√(ab)
Hope it helps you.
Your question is Ques- The set of numbers which are the multiples of five is -a) a finite set b) an infinite set c) a singleton set d) none of these.......
My answer is an infinite set