In the Following Series Find 20th Number

9, 5, 1, -3, -7, -11, :

  1.  -75
  2. -70
  3. -67
  4. -64
Monis Rasool Professor Asked on 20th November 2015 in Reasoning Questions.
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2 Answer(s)

Answer : (3) -67

 

sujeetstar24 Newbie Answered on 21st November 2015.
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Answer: (3) -67

Explanation:-
Formula-
n^th term of the series = a + (n – 1)d

Where, a = first firm  and d = difference between two terms.

Series :-  9, 5, 1, -3, -7, -11, ……….
a = 9 and d = 1 – 5 = – 4

Then, 20th number = 9 + (20 – 1) (-4)
= 9 + 19 (-4)
= 9 – 76
= – 67

Then, the 20th number of the given series is -67.

Hence, the answer is (3) -67.

Anurag Mishra Professor Answered on 21st November 2015.
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