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S3/S6
=(3a2)/[6*a(7/2)]
=1/3
a(7/2)=3/2*a2
a5=2a(7/2)-a2
=2a2
a(13/2)=2a5-a(7/2)
=2*2a2-3/2*a2
=5/2*a2
S6/S12
=[6a(7/2)]/[12a(13/2)]
=(9a2)/(30a2)
=3/10
=(3a2)/[6*a(7/2)]
=1/3
a(7/2)=3/2*a2
a5=2a(7/2)-a2
=2a2
a(13/2)=2a5-a(7/2)
=2*2a2-3/2*a2
=5/2*a2
S6/S12
=[6a(7/2)]/[12a(13/2)]
=(9a2)/(30a2)
=3/10
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