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plzzzzzzzz answer me fast it's important I will mark that person brilliant... surly but answer should be right..
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Answer:
Step-by-step explanation:
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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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