Question

How many are in A and B and C?

Short answer

There are 5 in A and B and C

$\mathrm{n}(\mathrm{A}\cap \mathrm{B}\cap \mathrm{C})=5$

Step-by-step solution

Step 1. Given information

Step 2. Calculation

$$\begin{gathered} \mathrm{From}\mathrm{the}\mathrm{venn}\mathrm{diagram}: \\ \mathrm{n}\left(\mathrm{A}\right)=\left\{15,3,2,5\right\} \\ \mathrm{n}\left(\mathrm{B}\right)=\left\{10,3,2,5\right\} \\ \mathrm{n}\left(\mathrm{C}\right)=\left\{15,2,2,5\right\} \\ \mathrm{n}(\mathrm{A}\cap \mathrm{B}\cap \mathrm{C})=5 \end{gathered}$$