1)b₅=b₁*q⁴
b₃=b₁*q₂
[tex] \frac{ b_{5} }{ b_{3} } = \frac{ b_{1} * q^{4} }{ b_{1} * q^{2} } [/tex]
se simplifica b₁ cu b₁ si q⁴ cu q² ramanand q²
[tex] \frac{8}{2} = q^{2} [/tex]
q²=4 => q=2
2=b₁*2² = > b₁=2/2² => b₁=1/2
b₇=b₁*q⁶ = 1/2 * 2⁶ = 1/2 * 64 = 32
bn=b₁*qⁿ⁻¹
S₈=[b₁*(q⁸-1)]/(q-1)
S₈=[1/2*(2⁸-1)]/(2-1) = 1/2* (256-1) = 1/2*255 = 255/2
Sn=[b₁*(qⁿ-1)]/(q-1) = [1/2*(2ⁿ-1)]/(2-1) = 1/2*(2ⁿ-1)
2) b₄=b₁*q₃
b₂=b₁*q
[tex] \frac{ b_{4} }{ b_{2} } = \frac{ b_{1} * q^{3} }{ b_{1} * q} [/tex]
se simplifica b₁ cu b₁ si q³ cu q (ramanand q²)
[tex] \frac{4}{4} = q^{2}[/tex]
q²=1 => q=1
b₁=b₂/q = 4/1=4
b₅=b₁*q⁴= 4*1⁴=4
bn=b₁*qⁿ⁻¹=4*1ⁿ⁻¹=4
S₃=[b₁(q³-1)]/(q-1) = [4(1-1)]/(1-1)= 0
s₆=[b1(q⁶-1)]/(q-1) = [4(1-1)]/(1-1)= 0
Sn=[b₁(qⁿ-1)]/(q-1)= [4(qⁿ-1)]/(1-1)=0
