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17 Mar 2020, 04:04
Kudos
Bookmarks
B
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:
90% (01:31) correct
10%
(01:50)
wrong
based on 224
sessions
History
Date
Time
Result
Not Attempted Yet
What is the sum of the numbers in the grid below?
A. 146
B. 147
C. 148
D. 149
E. 150
2020-03-17_1502.png [ 37.88 KiB | Viewed 10837 times ]
A. 146
B. 147
C. 148
D. 149
E. 150
Attachment:
2020-03-17_1502.png [ 37.88 KiB | Viewed 10837 times ]
17 Mar 2020, 04:27
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Bookmarks
Bunuel
Let the sum of nth row = Sn
--> Sum of first row, S1 = -2 -1 + 1 + 2 + 3 + 4 = 7
Note that sum of second row is twice of first row, sum of third row is thrice of first row so on . . . .
--> S2 = 2*7 = 14; S3 = 3*7 = 21, so on . . . .
--> sum of all numbers = S1 + S2 + S3 + S4 + S5 + S6
= 7 + 14 + 21 + 28 + 35 + 42
= 6/2*(7 + 42) = 3*49 = 147
Option B
17 Mar 2020, 04:30
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Bookmarks
Bunuel
Sum = (-2-1+1+2+3+4)(1+2+3+4+5+6) = 7*6*7/2 = 49*3 = 147
IMO B
