1. Sum of n term of a G.P is

**2ab/ a + b**

correct- A+ b/2
- n/2[2a + (n-1)d]
- A(1-r)/1-r

2. if a, d and Sn are the first terms , the common difference and the sum of first n terms of the series , then Sn =

- n/2[a + (n-1)d]
- a + (n-1)d
- n/2[2a + (n-1)d]
**correct** - n[2a + (n-1)d]

3. the common ratio of a geometric sequence cannot be

- 3
- 0
**correct** - 2
- 1

4. A function whose domain is the set of natural numbers is called the

- Series
- Identity function
- Sequence
**correct** - Onto function

5. the second term of the sequence with general term n2-4/2 is

- 3
- 1
- 0
**correct** - -3

6. the A.P whose nth term is 2n-1 is

- 2,3,5…
**correct** - 5,3,1…,
- 1,3,5….
- 1,3,6….

7. if n is total number of arithmetic means between a and b .the formula of mth arithmetic mean between a and b is

- a +m(a-b)/n+1
- a +n(b-a)/n+1
- none of these
- a +m(b-a)/n+1
**correct**

8. the fifth term and the nth term of the A.P. 1,5….are

- 17,4n-3
**correct** - 17,4n
- 17,3n-4
- 4n-3,17

9. The difference of two consecutive terms of an arithmetic sequence is called its:

- Common ratio
- Arithmetic mean
- Common difference
**correct** - Geometric mean

10. The next two terms of the sequence 1,3,7,15,31,…… are

- 102, 188
- 112, 144
- None of these
**correct** - 112, 228

11. A number A is said to be the arithmetic mean between two number a and b if a ,A, b is

- Not a sequence
- G P
- A sequence
- A.P
**correct**

12. A1 A2,…., An are said to be n arithmetic means between a and b if a, A1 A2,…., An ,b is

- A sequence
- Not a sequence
- G P
- A.P
**correct**

13. the arithmetic mean between a and b is

- a +b/ 2
**correct** - ±√ab
- a -b/ 2
- b –a/2

14. The series obtained by adding the terms of an arithmetic sequence is called the

- Infinite series
- Harmonic series
- Arithmetic
**correct** - Geometric series

15. the 7th tern of an arithmetic sequence whose first term is 2 and common difference is zero is

- 0
- 2
- 7
**correct** - 14

16. the common difference of the sequence 5,8,11,14,…..is

- 3
**correct** - -3
- 0
- 1

17. A sequence in which any term minus its immediate previous term gives a constant is called the

- Arithmetic sequence
**correct** - Complex sequence
- Harmonic sequence
- Geometric sequence

18. A sequence in which any term divided by its immediate previous term is called the

- Common Ratio
**correct** - Arithmetic mean
- Mean common
- Arithmetic progression

19. 2,4,6,8,10,12,….. is

- G.P
- A.P
- Arithmetic series
**correct** - Geometric series

20. the general term of a sequence is denoted by

- an
- na
- sn
**correct** - n

21. nth term of A.P. is

- a1 + (n – 1) d
**correct** - none of these
- a + nd
- a + d/n

22. 1,8,15,22,29,36,…. Is

- Geometric series
- Arithmetic series
- A.P
**correct** - G.P

23. the nth of an A.P is ½(3-n) ,the first three terns are

- 3,2,1
- 1,2,1
- 1,1/2,0
**correct** - 1,2,3

24. the arithmetic mean between 2+√2 and 2-√2 is

- 2
**correct** - 4
- 0
- √2

25. A sequence in which any term divided by its immediate previous term gives a constant is called the

- Real sequence
- Complex sequence
- Geometric sequence
**correct** - Arithmetic sequence