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24 Dec 2019, 05:21
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D
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Difficulty:
95%
(hard)
Question Stats:
35% (02:37) correct
65%
(02:02)
wrong
based on 65
sessions
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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
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AIvZUPu3nO-screen-shot-2018-07-02-at-100737-am.png [ 26.5 KiB | Viewed 2148 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 ?
