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If sequence S has 250 terms, what is the 243rd term of S ?

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If sequence S has 250 terms, what is the 243rd term of S ?  [#permalink]

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New post 20 Nov 2017, 00:13
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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.

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Re: If sequence S has 250 terms, what is the 243rd term of S ?  [#permalink]

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New post 20 Nov 2017, 00:28
(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
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Re: If sequence S has 250 terms, what is the 243rd term of S ?  [#permalink]

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New post 20 Nov 2017, 00:33
Bunuel wrote:
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.


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.
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Re: If sequence S has 250 terms, what is the 243rd term of S ?  [#permalink]

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New post 20 Nov 2017, 10:23
Nice Explanation...

rahul16singh28 wrote:
Bunuel wrote:
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.


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.

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Re: If sequence S has 250 terms, what is the 243rd term of S ? &nbs [#permalink] 20 Nov 2017, 10:23
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