Final answer:
The sum of the first five terms (S5) of the sequence {an} = {1 + 5/2n} is calculated to be 10.705. This does not match any of the provided options, indicating a possible error in the question or options.
Step-by-step explanation:
To calculate S5 for the sequence defined by {an} = {1 + 5/2n}, we need to find the sum of the first five terms of the sequence. To do this, we sum up an for n = 1 to 5.
The sequence is:
Adding these together, we get S5 = 3.5 + 2.25 + 1.83 + 1.625 + 1.5 = 10.705. However, this result does not match any of the options provided in the question. Therefore, either there is a miscalculation or the question/options might be incorrect. It's important to double-check the sequence formula and given options.