find the sum of the first 27 terms of the g.p 1/9+1/27+1/81
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a= 1/9
d= 1/27 - 1/9 = -2/27
n = 27.
Sn = n/2{2a+(n-1)d}
=27/2{2(1/9)+(26-1)(-2/27)}
=17/2 X (-46/2)
= -23.
d= 1/27 - 1/9 = -2/27
n = 27.
Sn = n/2{2a+(n-1)d}
=27/2{2(1/9)+(26-1)(-2/27)}
=17/2 X (-46/2)
= -23.
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