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Difficulty:
65%
(hard)
Question Stats:
51%
(01:45)
correct
49%
(01:51)
wrong
based on 76
sessions
History
Date
Time
Result
Not Attempted Yet
In a sequence of positive integers, \(A(n)\),the the terms is defined as \([A(n-1) - 1]^2\). If 9 is one of the terms of the sequence,then what are the two terms immediately next to the 9?
A){64,63^2} B){9,63} C){4,64} D){4,9} E){63,64}
Source =>NOVA.
P.S=> This might turn out to be a poor quality question.I feel it has language issues
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Hi Bunuel Here is my doubt => In the OE the writer is assuming that the word immediately next means the closest vicinity. Hence he calculated the previous term and the next term instead of the next two terms. I don't think he is correct with that mindset. Shouldn't the term immediately next mean the next two terms?
Ideally the question should ask: 'What are the two terms immediately adjacent to 9'.
Here we know that a2 = (a1-1)^2, a3 = (a2-1)^2.. and so on..
so the term immediately after 9 = (9-1)^2 = 8^2 = 64
Let the term previous to 9 be x. 9 = (x-1)^2 or x-1 = 3 Or x-1= -3 which gives two values of x: x = 4 or x = -2 But since its given that its a sequence of positive integers, we will ignore -2. Thus the previous term is 4.
So the two terms immediately adjacent to 9 are : 4 and 64
hence answer is C
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