Correct Answer :
1024144
Solution :
The correct option is 1024144.
Step-by-Step Explanation:
We are given a sequence defined by:
and the recurrence relation for :
Since the sum we want to compute only involves terms with even subscripts (), let us determine the general pattern for the even terms by substituting even values for (letting for integers ):
For :
For ():
For ():
By induction, the general term for any even index is:
Taking the reciprocal of each term gives:
We are asked to evaluate the sum:
The last term corresponds to .
Substituting the reciprocal formula into the sum, we get:
The sum of the first odd positive integers is given by the formula:
For :
Taking the absolute value (or depending on the sign convention of the question), the magnitude of the sum is:
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