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Find the sum of geometric sequence where the first term is 5, the last term is 1280 and the common ratio is 4.
A. 1, 705
B. 1, 685
C. 1,630
D. 1, 750
Find the sum of geometric sequence where the first term is 5, the last term is 1280 and the common ratio is 4.
A. 1, 705
B. 1, 685
C. 1,630
D. 1, 750
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Answer:
A. 1075
Step-by-step explanation:
sn=a1(1-rn)/1-r
=5(1-4⁵)/1-4
=5(1-1024)/-3
=5(-1023)/-3
=-5115/-3
=1705