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# There is a row of integers:

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SVP
Joined: 03 Feb 2003
Posts: 1604
There is a row of integers:  [#permalink]

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19 Jun 2003, 00:18
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There is a row of integers:
10—12—15—20—X—46—79

find the missing member X.

(A) 32
(B) 31
(C) 30
(D) 29
(E) 28
SVP
Joined: 03 Feb 2003
Posts: 1604

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30 Jun 2004, 07:01
this question is still hanging unanswered
Senior Manager
Joined: 26 Jan 2004
Posts: 400
Location: India

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30 Jun 2004, 07:32
Got it. (D) it is.

10 12 15 20 29 46 79 144
diff: 2 3 5 9 17 33 65
diff: 1 2 4 8 16 (for next element)32

SVP
Joined: 03 Feb 2003
Posts: 1604

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30 Jun 2004, 07:35
Yes, the answer lies on the second level of differences.
30 Jun 2004, 07:35
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# There is a row of integers:

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