Question

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Answer 1

Answer:

1. a.
2. c.
3. b.
4. d.
5. a.
6. a.
7. c.
8. b.
9. c.
10. c.
11. d.
12. a.
13. b.
14. d.
15. a.
16. c.
17. a.
18. d.
19. a.
20. a.

Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

1.

c).25

explanation:

we have given ,d=5

acc. to Question:

t18-t13=?

this can also be written as :

(t1 + 17d ) -(t1+12d)

=> t1 +17d -t1 -12d

=> 5d = 5×5 = 25.

2. (d)58

-11, -8,-5....,49

this A.P can also be written as:

49, 46,43........,-11

here , d= 3

and a1 = 49

now ,

a4 = a1+3d

= 49+3×3= 49+9= 58.

3. (a)0

4. (a) -75

5. (d)40

6.(b) 80

7.(a) true

8.(c)30

9. (a) 1

10. (a)3n+7

11.(a)45

12.(b)87

13.(b)38

14.(c) n(n+1)/2

15.(c)15

16.(d) 17

17.(d) -79

18.(c) 6

19.(b)22

20.(b)28.

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