The sum of 20 terms of the G.P. 10, 20, 40, ...... is : 1. 10(2 19 - 1) 2. 10(2 21 - 1) 3. 10(2 20 - 1) 4. none of these

By formula, Common ratio = Given, G.P. = 10, 20, 40, ...... a = 10 and r = = 2. We know that, If | r | 1 Sum of n terms of G.P. (S n ) = Substituting values we get : Hence, Option 3 is the correct option.

The geometric mean between 8 and 32 is :
24
256
40
16

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Find the sum of G.P. :
1 + 3 + 9 + 27 + …….. to 12 terms

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Find the sum of G.P. :
0.3 + 0.03 + 0.003 + 0.0003 + …… to 8 terms.

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Mathematics

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

AP GP

Related Questions

The geometric mean between 8 and 32 is :
24
256
40
16

Find the sum of G.P. :
1 + 3 + 9 + 27 + …….. to 12 terms

Find the sum of G.P. :
0.3 + 0.03 + 0.003 + 0.0003 + …… to 8 terms.

Mathematics

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

AP GP

Related Questions

The geometric mean between 8 and 32 is :242564016

Find the sum of G.P. :1 + 3 + 9 + 27 + …….. to 12 terms

Find the sum of G.P. :0.3 + 0.03 + 0.003 + 0.0003 + …… to 8 terms.

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

The geometric mean between 8 and 32 is :
24
256
40
16

Find the sum of G.P. :
1 + 3 + 9 + 27 + …….. to 12 terms

Find the sum of G.P. :
0.3 + 0.03 + 0.003 + 0.0003 + …… to 8 terms.