Find the sum of G.P. :
1 + 3 + 9 + 27 + …….. to 12 terms
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The sum of 20 terms of the G.P. 10, 20, 40, …… is :
10(219 - 1)
10(221 - 1)
10(220 - 1)
none of these
0.3 + 0.03 + 0.003 + 0.0003 + …… to 8 terms.