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20 Nov 2023, 02:20
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C
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Difficulty:
55%
(hard)
Question Stats:
55% (01:47) correct
45%
(01:24)
wrong
based on 74
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If r and s are positive integers, is rs a multiple of 25?
(1) r - s is a multiple of 5
(2) rs is a multiple of 5
(1) r - s is a multiple of 5
(2) rs is a multiple of 5
24 Nov 2023, 15:32
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Bunuel
(1) r - s is a multiple of 5
\(6-1 =\) NO
\(10-5=\) Yes
INSUFF
(2) rs is a multiple of 5
\(5*1=\) NO
\(5*5=\) YES
1+2
Only possible when both \(r\) and \(s\) are multiples of \(5\)
Hence we can answer with a definite YES
SUFF.
Ans C
Hope it helped.
