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U2=12
ar^4 = 324
ar. = 12
---------------- -
r^3 = 27
r. = 3
ar. = 12
a3. = 12
a = 12/3
a = 4
S6 = 4( 3^6 - 1)/3-1
= 4(729 - 1)/2
=2 (728)
= 1456