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14 Jan 2018, 06:28
Kudos
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
47% (01:30) correct
53%
(01:40)
wrong
based on 146
sessions
History
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Not Attempted Yet
What is the hundredths digit in the decimal expression of r/55?
(1) r is the least common denominator of 1/7 and positive integer x.
(2) r is prime.
(1) r is the least common denominator of 1/7 and positive integer x.
(2) r is prime.
14 Jan 2018, 14:01
Kudos
Bookmarks
Bunuel
To know the digits in a decimal expansion, we need to know the remainder of r/55.
We'll look for the statement that gives us this information, a Logical approach.
(1) The LCD of 1/7 and x/1 is the same as the least common multiple of 7 and 1 which is 7.
So r = 7 which is sufficient.
(2) This does not give us the information we need (the remainder)
Insufficient!
(A) is our answer.
