
If the term of the series 25 + 29 + 33 + 37+ …. And 3 + 4 + 6 + 9 + 13 …. are equal, then what is the value of n?
(a) 11
(b) 12
(c) 13
(d) 14
Answer
514.5k+ views
Hint: To solve this question first, we will need to find the term of the each given series as we can observe first given series are in A.P. and we know that the term of the A.P. is given by where a is the first term of the A.P. and d is the common difference of the A.P. similarly to find the term of the second series we can observe that difference of the second series is in A.P. so we can let it’s term as where a, b, c are any 3 arbitrary constants(we know terms of the series so make equations and solve for term). So, find the term of both series and equate them to find the value of n.
Complete step-by-step solution:
We can observe that the first series is in A.P.,
And we need to find of n for which term of the both given series are equal.
First series we have,
25 + 29 + 33 + 37 + …
Here first term(a) = 25 and common difference(d) = 29 – 25 = 4,
Hence for the term of the first series we get,
Second series we have,
3 + 4 + 6 + 9 + 13 ….
Here we can observe that the difference of the two consecutive terms is in A.P. i.e. 1, 2, 3, 4, … and we know that in that case we need to let the term as where are any three random constants now, and we are given that
By solving above three equations, we get
Hence, We get term of the second series as,
Now by equating equations (1) and (2), we get
After cross-multiplying, we have
Hence we get two values of as 12 and -3 but as cannot be negative so .
Hence option (b) is the correct answer.
Note: You need to observe both of the given series carefully in order to solve this problem. And this question involves a lot of calculations so make sure to do that carefully also. And remember whenever difference of the given series is in A.P. then we can let the term of the series as where are any three random constants.
Complete step-by-step solution:
We can observe that the first series is in A.P.,
And we need to find of n for which
First series we have,
25 + 29 + 33 + 37 + …
Here first term(a) = 25 and common difference(d) = 29 – 25 = 4,
Hence for the
Second series we have,
3 + 4 + 6 + 9 + 13 ….
Here we can observe that the difference of the two consecutive terms is in A.P. i.e. 1, 2, 3, 4, … and we know that in that case we need to let the
By solving above three equations, we get
Hence, We get
Now by equating equations (1) and (2), we get
After cross-multiplying, we have
Hence we get two values of
Hence option (b) is the correct answer.
Note: You need to observe both of the given series carefully in order to solve this problem. And this question involves a lot of calculations so make sure to do that carefully also. And remember whenever difference of the given series is in A.P. then we can let the
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