**1.**If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are

- 3,5,6,8
- 5,10,15,20
- 20,30,40,50
- 3,6,8,10

*Answer - [5,10,15,20 ]***2.**If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is:

- 4450
- 3200
- 450
- 7680

*Answer - [ 3200 ]***3.**The common difference of an A.P., the sum of whose n terms is S

_{n}, is:

- Sn - 2Sn - 1 + Sn - 2
- Sn - Sn - 1
- Sn - Sn - 2
- Sn - 2Sn - 1 - Sn - 2

*Answer - [ a ]***4**. Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30

^{th}terms is:

- 4
- 5
- 17
- 10

**Answer - [5 ]****5.**If the n

^{th}term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is:

- n(n+2)
- n(n-2)
- n+2
- n+1

**Answer - [ n(n+2) ]****6.**If the sum of n terms of an A.P. be 3n

^{2}+ n and its common difference is 6, then its first term is:

- 3
- 4
- 5
- 1

*Answer - [ 4 ]***7.**How many terms are there in 20, 25, 30......... 140?

- 34
- 25
- 13
- 44

*Answer - [ 25 ]***8.**Find the first term of an AP whose 8

^{th}and 12

^{th}terms are respectively 39 and 59.

- 2
- 4
- 5
- 6

*Answer - [4 ]***9.**Find the 15

^{th}term of the sequence 20, 15, 10 . . . .

- -20
- -30
- -50
- 1

*Answer - [-50 ]***10.**The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is :

- 535
- 565
- 680
- 683

*Answer - [ 680 ]*
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