Five element

The geometric sequence is given by quotient q = 1/2 and the sum of the first six members S6 = 63. Find the fifth element a5.

Correct result:

a5 =  2


q=1/2=12=0.5 s6=63  s6=q61q1 a1  a1=s6 q1q61=63 0.510.561=32  a5=a1 q4=32 0.54=2

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