same question almost i think

Mathematics
Tutor: None Selected Time limit: 1 Day

Find S12 for the series 1 + 1.5 + 2.25 + 3.375

Find S5 for the series -2 + -10 + -50 + -250 

Find S9 for the series 1 + 5 + 25 + 125 +

Find S10 for the series 1 + 2 + 4 + 8 

May 7th, 2015

Please take these problems into paid category and I will do all of them. It is to much to write

May 7th, 2015

i dont have any money but a dollar

May 7th, 2015

1. q=1.5/1=1.5  b1=1

Sn=[b1*(1-q^n)]/(1-q)

S12=[1*(1-(1.5)^12)]/(1-1.5)=257.5

2. b1=-2, q=5

S5=[(-2)*(1-5^5)]/(1-5)=-1562

3.b1=1 q=5

S9=[1*(1-5^9)]/(1-5)=488281

4. b1=1 q=2

S10=[1*(1-2^10)]/(1-2)=1023

May 7th, 2015

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