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24 Dec 2019, 05:21
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
35% (02:37) correct
65%
(02:02)
wrong
based on 65
sessions
History
Date
Time
Result
Not Attempted Yet
In the number pyramid shown, where all numbers are positive integers, each number is the sum of the two numbers below it {eg. a=b+c; b= d+e}. What is the maximum number of odd integers that can be in the pyramid?
A. 4
B. 5
C. 6
D. 7
E. 8
A. 4
B. 5
C. 6
D. 7
E. 8
Attachments
AIvZUPu3nO-screen-shot-2018-07-02-at-100737-am.png [ 26.5 KiB | Viewed 2133 times ]
24 Dec 2019, 05:58
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nick1816
Possible arrangement for maximum odd integers
-- -- -- -- -- -- O -- -- -- -- ---
-- -- -- -- -- E -- -- O -- -- -- --
-- -- -- - O -- --O -- -- E -- -- -
-- -- O -- -- E -- -- O -- -- O -- -
--> Total odd integers = 7
IMO Option D
07 Jan 2020, 03:15
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nick1816
Can anyone explain this ?
