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03 Apr 2018, 21:27
Kudos
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C
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Difficulty:
15%
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Question Stats:
79% (01:18) correct
21%
(00:44)
wrong
based on 135
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If \(a_n = a_1 + (n - 1)d\), what is the value of \(a_{51}\)?
(1) \(a_{11} = 25\)
(2) \(a_{21} = 45\)
(1) \(a_{11} = 25\)
(2) \(a_{21} = 45\)
03 Apr 2018, 21:28
Kudos
Bookmarks
Bunuel
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03 Apr 2018, 21:58
Kudos
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Bunuel
from1 :
\(a_{11} = 25\)
then
\({11} = a_1 + (11 - 1)d\),
two variables a_1 and d
one equation ,so insufficent.
from2: two variables a_1 and d
one equation ,so insufficent.
combinig both: two variables two equation hence sufficient.
C
