**Question 1:**
How many four-digit numbers can you get out of $\text{\hspace{0.17em}}0,\text{\hspace{0.17em}}3,\text{\hspace{0.17em}}7,\text{\hspace{0.17em}}8\text{\hspace{0.17em}}$
?

**Question 2:**
There are $\text{\hspace{0.17em}}19\text{\hspace{0.17em}}$
balls in the box: $\text{\hspace{0.17em}}10\text{\hspace{0.17em}}$
of red ones and $\text{\hspace{0.17em}}9\text{\hspace{0.17em}}$
of blue ones. In how many ways can two balls of the same color be picked?

**Question 3:**
In how many ways can you pick a captain and his deputy in a group of $\text{\hspace{0.17em}}23\text{\hspace{0.17em}}$
soldiers?

**Question 4:**
John has $\text{\hspace{0.17em}}4\text{\hspace{0.17em}}$
cats. In how many ways he can take $\text{\hspace{0.17em}}2\text{\hspace{0.17em}}$
of them in his hands (one - in left hand, another - in right)?

**Question 5:**
Three passengers walk into the elevator of the $\text{\hspace{0.17em}}11$-floor building (ground floor is not included). In how many ways all three passengers can get out on different floors?

Please note, you have solved only half of the test. For the complete test get a Must Have account.

Get started