Trắc nghiệm Cấp số nhân có đáp án (Vận dụng) !!

A. 12

B. 13

C. 14

D. 15

A. F = 389 hoặc F = 395

B. F = 395 hoặc F = 179

C. F = 389 hoặc F = 179

D. F = 441 hoặc F = 357

A. $\frac{\left(\mathrm{n}+1\right){\mathrm{a}}^{\mathrm{n}+2}-\left(\mathrm{n}+2\right){\mathrm{a}}^{\mathrm{n}+1}+1}{{\left(1-\mathrm{a}\right)}^2}$

B. $\frac{\left(\mathrm{n}+1\right){\mathrm{a}}^{\mathrm{n}+2}+\left(\mathrm{n}+2\right){\mathrm{a}}^{\mathrm{n}+1}+1}{{\left(1-\mathrm{a}\right)}^2}$

C. $\frac{\left(\mathrm{n}+1\right){\mathrm{a}}^{\mathrm{n}+2}-\left(\mathrm{n}+2\right){\mathrm{a}}^{\mathrm{n}+1}-1}{{\left(1-\mathrm{a}\right)}^2}$

D. $\frac{\left(\mathrm{n}+1\right){\mathrm{a}}^{\mathrm{n}+2}+\left(\mathrm{n}+2\right){\mathrm{a}}^{\mathrm{n}+1}-1}{{\left(1-\mathrm{a}\right)}^2}$

A. S = 2046

B. S = 2097150

C. S = 2095104

D. S = 1047552

A. $\frac{{10}^{11}-100}{84}$

B. $\frac{{10}^{10}-100}{84}$

C. $\frac{{10}^9-100}{84}$

D. $\frac{{10}^8-100}{84}$

A. 1

B. 2

C. −1

D. −2

A. $2,22.{10}^{-15}$

B. $2,21.{10}^{-15}$

C. $2,20.{10}^{-15}$

D. $2,23.{10}^{-15}$

A. −4.

B. 4.

C. −3.

D. 3.

A. 3183624

B. 2343625

C. 2343626

D. 2343627

A. ${\mathrm{u}}_{2018}=\frac{2^{2016}}{3^{2017}}+\frac{1}{2019}$

B. ${\mathrm{u}}_{2018}=\frac{2^{2018}}{3^{2017}}+\frac{1}{2019}$

C. ${\mathrm{u}}_{2018}=\frac{2^{2017}}{3^{2018}}+\frac{1}{2018}$

D. ${\mathrm{u}}_{2018}=\frac{2^{2017}}{3^{2018}}+\frac{1}{2019}$