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a= 3
r = 6/3= 2
sn = a ( r^n - 1) /( r -1)
= 3 ( 2^6 - 1) / ( 2-1)
= 3 (64 - 1)
= 3* 63=
= 189....c
manual
3 + 6 + 12 + 24 + 48 + 96 = 189....c