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09 May 2018, 01:22
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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:
91% (00:42) correct
9%
(01:18)
wrong
based on 111
sessions
History
Date
Time
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Not Attempted Yet
If r?s = r(r - s) for all integers r and s, then 4?(3?5) equals
A) -8
B) -2
C) 2
D) 20
E) 40
A) -8
B) -2
C) 2
D) 20
E) 40
09 May 2018, 02:20
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Bunuel
we have to act as per the given function: r?s= r(r-s)
we are given that = 4?(3?5)
4? {3(3-5)}
= 4?(-6)
=4{4-(-6)}
=4(4+6)
=4*10
=40
the correct answer is E.
09 May 2018, 04:37
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Bunuel
\(Given : r?s = r(r - s)\)
\(So, 4?(3?5)\)
\(4 ? [3 (3 - 5)]\)
\(4 ? [3 * (-2)]\)
\(4 ? [-6]\)
\(4 * [{4 - (-6)}]\)
\(4 * [10]\)
\(40\)
\((E)\)
