Saturday

January 31, 2015

January 31, 2015

Posted by **Anonymous** on Sunday, January 6, 2013 at 9:13pm.

- FUNCTION 11..HELP! -
**PJ**, Sunday, January 6, 2013 at 9:27pmThe sun of the first five terms of a geometric series is 186 and the sum of the first six terms is 378. if the fourth term is 48, determine a,r, t10, S10

- FUNCTION 11..HELP! -
**Steve**, Monday, January 7, 2013 at 10:31amSince S6 = S5 + T6,

378 = 186 + T6

T6 = 192

T6 = T4*r^2

192 = 48r^2

r^2=4

r=2

T4 = ar^3

48 = 8a

a = 6

Sequence is thus

6, 12, 24, 48, 96, 192, ...

T10 = 6*2^9 = 3072

S10 = 6*(1023) = 6138

**Answer this Question**

**Related Questions**

Geometric series - The sum of the first five terms of a geometric series is 186 ...

Geometric - 1) The sum of last three terms of GP having n terms is 1024 time the...

Math(arithmetic & Geometric Series) - 1)The sum of 6 terms of an arithmetic ...

arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...

arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...

math - The sum of the first 10 terms of an arithmetic series is 145 and the sum ...

math help!! - the first term in a geometric series is 4 and the sum of the first...

Math. - The first term of a geometric series is 4 and the sum of the first three...

math - The sum of first 12 terms of an arithmetic series is 186, and the 20th ...

Maths - 1..The first 2 terms of a geometric progression are the same as the ...