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02 Mar 2019, 00:08
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
44% (01:54) correct
56%
(01:22)
wrong
based on 183
sessions
History
Date
Time
Result
Not Attempted Yet
In how many ways can a square be identified in a chess board (8x8 squares) (figure attached)?
A) 64
B) 65
C) 204
D) 205
E) 408
https://www.GMATinsight.com
A) 64
B) 65
C) 204
D) 205
E) 408
https://www.GMATinsight.com
Attachments
chess.jpg [ 44.46 KiB | Viewed 3964 times ]
Archit3110
02 Mar 2019, 03:58
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GMATinsight
total no of squares which can be formed in a 8x8 chess board :
no of 1*1 squares ; 8*8 = 64,
2*2 squares= 7*7 , 3*3 squares = 6*6;36, 4*4 squares=5*5
5*5 squares = 4*4
6*6 squares = 3*3
7*7 squares =2*2
8*8 squares = 1*1
total
1^2+2^2+3^2+....+8^2
1+4+9+16+25+36+49+64
IMO C ; 204
07 Mar 2019, 16:57
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Archit3110
Hello Archit3110 !
Could you please explain to me how do you get to 2*2 = 7*7 and 3*3 = 6*6?
I'm having trouble to see those squares.
Kind regards!
