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Let x1, x2, x3......xn be a sequence of positive numbers whe
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15 Apr 2018, 08:24
15 Apr 2018, 08:24
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20% (01:44) wrong based on 45 sessions
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Let x1, x2, x3......xn be a sequence of positive numbers where X1 = 1, and Xn+1 = Xn + 4. What represents the nth term in the sequence?
A. -3n
B. 3n - 4
C. 4n - 3
D. 4n - 4
E. 5n
A. -3n
B. 3n - 4
C. 4n - 3
D. 4n - 4
E. 5n
Re: Let x1, x2, x3......xn be a sequence of positive numbers whe
[#permalink]
16 Apr 2018, 01:33
16 Apr 2018, 01:33
1
\(1\)st term \(= 1\) (given)
\(2\)nd term \(= 1 + 4 = 5\)
\(3\)rd term \(= 5 + 4 = 9\)
We have \(5\) ans choices each expression contains \(n\) which is the number of terms
Equating each expression with a term in our sequence should give us the ans
let us suppose 2nd term which is \(5\)
Among the ans choices whichever returns with a value for \(n = 2\) is the ans
option c does exactly that when \(4n -3 =5\)
or, \(4n = 8\) hence, \(n = 2\)
option c
\(2\)nd term \(= 1 + 4 = 5\)
\(3\)rd term \(= 5 + 4 = 9\)
We have \(5\) ans choices each expression contains \(n\) which is the number of terms
Equating each expression with a term in our sequence should give us the ans
let us suppose 2nd term which is \(5\)
Among the ans choices whichever returns with a value for \(n = 2\) is the ans
option c does exactly that when \(4n -3 =5\)
or, \(4n = 8\) hence, \(n = 2\)
option c
Re: Let x1, x2, x3......xn be a sequence of positive numbers whe
[#permalink]
31 May 2019, 06:51
31 May 2019, 06:51
1
Just a second thought:
Nth term= first term + ( N term - first term) difference between terms
So,Nth term = 1+ ( n-1)4 [ as the common difference is 4 ]
So, Nth term = 4n-3, Which is the same to the answer option C.
Is this correct approach ?
Nth term= first term + ( N term - first term) difference between terms
So,Nth term = 1+ ( n-1)4 [ as the common difference is 4 ]
So, Nth term = 4n-3, Which is the same to the answer option C.
Is this correct approach ?
