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A \(35\)

B \(120\)

C \(240\)

D \(720\)

A \(C_7^3\)

B \(A_7^3\)

C \(\frac{{7!}}{{3!}}\)

D \(7\)

A \(7!\)  

B \({7^4}\)

C \(7.6.5.4\)

D \(7!.6!.5!.4!\)

A \(x = 10\)

B \(x = 11\)

C \(x = 11\) hay \(x = 10\)

D \(x = 0\)

A \(3 \le x \le 4\)

B \(3 \le x\)

C \(x \le 4\)

D \(x > 4,x < 3\)

A \(n = 30.\)

B \(n = 32.\)

C \(n = 31.\)

D \(n = 33.\)

A \(5 \le n < 10\)

B \(n\) là một số chia hết cho 5.

C \(n < 5\)

D \(n > 11\)

A \(120\)

B \(216\)

C \(312\)          

D \(360\)

A \(\frac{{31}}{{32}}\)

B \(\frac{{21}}{{32}}\)           

C \(\frac{{11}}{{32}}\)           

D \(\frac{1}{{32}}\)

A \(\frac{1}{4}\)

B \(\frac{4}{9}\)

C \(\frac{1}{9}\)

D \(\frac{5}{9}\)

A \(C_{15}^6C_9^4\)

B \(C_{15}^6C_9^4\)

C \(C_{15}^3C_9^4\)

D \(C_{30}^2\)

A \(n = 15\)

B \(n = 27\)

C \(n = 8\)

D \(n = 18\)

A \(2017.2018\)

B \(C_{2017}^2 + C_{2018}^2\)

C \(C_{2017}^2C_{2018}^2\)

D \(C_{4015}^4\)

A \(n = 8.\)

B \(n = 12.\)     

C \(n = 6.\)     

D \(n = 16.\)

A \(x = \frac{1}{3}\)

B \(x =  \frac{1}{2}\)

C \(x =  - \frac{1}{2}\)

D \(x =  - \frac{1}{3}\)

A \(\frac{7}{{125}}\)

B \(\frac{7}{{375}}\)

C \(\frac{7}{{250}}\)

D \(\frac{{14}}{{375}}\)

A \(\frac{5}{{14}}\)

B \(\frac{{79}}{{84}}\)

C \(\frac{5}{{84}}\)

D \(\frac{9}{{14}}\)

A \(1 + 2A_{2018}^2 + 2\left( {C_{2017}^2 + A_{2017}^2} \right) + \left( {C_{2017}^3 + A_{2017}^3} \right) + C_{2017}^4\)

B \(1 + 2C_{2018}^2 + 2C_{2018}^3 + C_{2018}^4 + C_{2018}^5\)                               

C \(1 + 2A_{2018}^2 + 2A_{2018}^3 + A_{2018}^4 + C_{2017}^5\)                           

D \(1 + 4C_{2017}^1 + 2\left( {C_{2017}^2 + A_{2017}^2} \right) + \left( {C_{2017}^3 + A_{2016}^2 + C_{2016}^2} \right) + C_{2017}^4\)

A \(32\)

B \(33\)

C \(34\)

D \(35\)

A \(\frac{{4473}}{{8128}}\)

B \(\frac{{2279}}{{4064}}\)

C \(\frac{{55}}{{96}}\)

D \(\frac{{53}}{{96}}\)