Consider two sequences starting with the following terms: (i) a1=100, a2=87, a3=74, (ii) a1=1, az=, a3=16 Let S denote the sum of the first n terms of a given sequence. Out of these two sequences...

Extracted text: Consider two sequences starting with the following terms: (i) a1=100, a2=87, a3=74, (ii) a1=1, az=, a3=16 Let S denote the sum of the first n terms of a given sequence. Out of these two sequences given above, identify the geometric sequeice. Find S4correct to 4 decimal places for the geometric sequence.