## 1. 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 thes

1. 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 ……….

Part – B

9. If A={1 , 2 , 3 , 4} and B={3 , 4 , 5 , 6 , 7} find (i) AUB (ii) AՈB (iii) A-B (iv) B-A .

10. Which term of the A.P. 3 , 8 , 13 , 18 , …………… is 78 ?

11. In a survey of 400 students in a school, 100 were listed as taking apple

juice, 150 as taking orange juice and 75 were listed as taking both apple as well

as orange juice. Find how many students were taking neither apple juice nor

orange juice. OR

Find the sum of series: 7 + 77 + 777 + …………………. To n terms.

12. Find Mean deviation about mean for the following data:

Xi 5 10 15 20 25

FI 7 4 6 3 5

## Answers ( )

Answer:an infinity set 5 10 15 20 25 30 35