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Attend this session to evaluate your current skill level, learn process skills, and solve through tough Arithmetic questions.
15 Oct 2019, 07:02
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
93% (00:25) correct
7%
(00:16)
wrong
based on 196
sessions
History
Date
Time
Result
Not Attempted Yet
If \(S = \frac{n(n + 1)}{2}\) and \(n = 40\), then \(S =\)
A. 121
B. 162
C. 420
D. 780
E. 820
A. 121
B. 162
C. 420
D. 780
E. 820
15 Oct 2019, 07:36
Kudos
Bookmarks
Bunuel
If \(S = \frac{n(n + 1)}{2}\) and \(n = 40\), then \(S =\)
A. 121
B. 162
C. 420
D. 780
E. 820
A. 121
B. 162
C. 420
D. 780
E. 820
\(S = \frac{40(40 + 1)}{2}\)
\(S = \frac{40^2 + 40}{2}\)
\(S = \frac{1600 + 40}{2}\)
\(S = \frac{1640}{2}\)
S = 820
15 Oct 2019, 07:45
Kudos
Bookmarks
Bunuel
If \(S = \frac{n(n + 1)}{2}\) and \(n = 40\), then \(S =\)
A. 121
B. 162
C. 420
D. 780
E. 820
\(S = \frac{40*41}{2}\) A. 121
B. 162
C. 420
D. 780
E. 820
Or, \(S = 20*41\)
Or, \(S = 820\) , Answer must be (E)
