What is the sum of the first 20 terms of an A.P., if a 4 and t20 = 36 ?
(A) 40 (B) 200 (C) 400 (D) 800
Answers
Answered by
10
Answer:
2, 4, 6, 8,....
The given sequence is an A.P.
Common difference = Second term − First term
= 4 − 2
= 2
(2) 2,
5
2
, 3,
7
3
,....
The given sequence is not an A.P.
(3) –10, –6, –2, 2...
The given sequence is an A.P.
Common difference = Second term − First term
= (−6) − (−10)
= 4
(4) 0.3, 0.33, 0.333,...
The given sequence is not an A.P.
(5) 0, –4, –8, –12,...
The given sequence is an A.P.
Common difference = Second term − First term
= (−4) − (0)
= −4
Answered by
7
Answer:
200
Step-by-step explanation:
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