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20 Nov 2017, 00:13
Kudos
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B
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:
89% (00:39) correct
11%
(00:35)
wrong
based on 131
sessions
History
Date
Time
Result
Not Attempted Yet
If sequence S has 250 terms, what is the 243rd term of S ?
(1) The 242nd term of S is -494.
(2) The first term of S is-12, and each term of S after the first term is 2 less than the preceding term.
(1) The 242nd term of S is -494.
(2) The first term of S is-12, and each term of S after the first term is 2 less than the preceding term.
20 Nov 2017, 00:28
Kudos
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(1) We don't know the increment, so cannot find 243d term
(2) We know the value of the first term and the increment, so we can find out the value of 243d term
S243= -12 - 2*242= -12-484 = -496
(2) We know the value of the first term and the increment, so we can find out the value of 243d term
S243= -12 - 2*242= -12-484 = -496
rahul16singh28
Joined: 31 Jul 2017
Last visit: 09 Jun 2020
Posts: 428
Given Kudos: 752
Location: Malaysia
Schools: INSEAD Jan '19
GPA: 3.95
WE:Consulting (Energy)
20 Nov 2017, 00:33
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Bunuel
nth term of an AP series is given by Tn = a + (n-1)d
here, a = -12, d = -2
T 243 = -496. So, B is sufficient.
