8, x and 32 are in G.P., then the value of x is :
24
256
40
16
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The sum of first four terms of the G.P. 2, 6, 18, ………, is :
26
80
160
52
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