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19 Jul 2019, 06:13
Kudos
Bookmarks
C
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Difficulty:
55%
(hard)
Question Stats:
50% (01:13) correct
50%
(00:56)
wrong
based on 8
sessions
History
Date
Time
Result
Not Attempted Yet
Fourth term of an arithmetic progression is 8. What is the sum of the first 7 terms of the arithmetic progression?
(a) 7
(b) 64
(c) 56
(d) Cannot be determined
(a) 7
(b) 64
(c) 56
(d) Cannot be determined
20 Jul 2019, 22:08
Kudos
Bookmarks
cfc198
Fourth term of an arithmetic progression is 8
--> a + 3d = 8 ....... (1)
sum of the first n terms of the arithmetic progression = n/2(first term + last term)
--> Sum of first 7 terms = 7/2{a + (a + 6d)}
= 7/2{2a + 6d}
= 7(a + 3d)
= 7*8
= 56
IMO Option C
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