Sequences & Series · NDA previous year questions

2013 3 questions

1. Q62013 · 11 Aug 2013

   If the positive integers $a,b,c,d$ are in AP, then the numbers $abc,abd,acd,bcd$ are in

   1. A.HP
   2. B.AP
   3. C.GP
   4. D.None of the above
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   Answer: A

2. Q412013 · 11 Aug 2013

   The sum of the first five terms and the sum of the first ten terms of an AP are same. Which one of the following is the correct statement?

   1. A.The first term must be negative
   2. B.The common difference must be negative
   3. C.Either the first term or the common difference is negative but not both
   4. D.Both the first term and the common difference are negative
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   Answer: C

3. Q272013 · 14 Apr 2013

   If the numbers $n-3,4n-2,5n+1$ are in AP, what is the value of n ?

   1. A.1
   2. B.2
   3. C.3
   4. D.4
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   Answer: A