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20 Nov 2017, 00:13
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B
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Difficulty:
5%
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Question Stats:
91% (00:39) correct
9%
(00:42)
wrong
based on 115
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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
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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
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WE:Consulting (Energy)
20 Nov 2017, 00:33
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Bunuel
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.
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.
