$ (a_n)_{n \equal{} 1}^\infty$ is defined on real numbers with $ a_n \not \equal{} 0$, $ a_na_{n \plus{} 3} \equal{} a_{n \plus{} 2}a_{n \plus{} 5}$ and $ a_1a_2 \plus{} a_3a_4 \plus{} a_5a_6 \equal{} 6$. So  $ a_1a_2 \plus{} a_3a_4 \plus{} \cdots \plus{}a_{41}a_{42} \equal{} ?$

$\textbf{(A)}\ 21  \qquad\textbf{(B)}\ 42  \qquad\textbf{(C)}\ 63  \qquad\textbf{(D)}\ 882  \qquad\textbf{(E)}\ \text{None}$
1. Given the sequence \((a_n)_{n=1}^\infty\) with \(a_n \neq 0\) and the relation \(a_n a_{n+3} = a_{n+2} a_{n+5}\), we need to find the sum \(a_1a_2 + a_3a_4 + \cdots + a_{41}a_{42}\).

2. We start by analyzing the given relation \(a_n a_{n+3} = a_{n+2} a_{n+5}\). This implies that the product of terms separated by 3 indices is equal to the product of terms separated by 5 indices.

3. We are also given that \(a_1a_2 + a_3a_4 + a_5a_6 = 6\).

4. To find the sum \(a_1a_2 + a_3a_4 + \cdots + a_{41}a_{42}\), we observe the pattern in the indices. The sum involves pairs of terms with indices increasing by 2 each time.

5. Notice that the sequence of pairs \((a_1a_2, a_3a_4, a_5a_6, \ldots)\) repeats every 6 terms because of the given relation. This is because the relation \(a_n a_{n+3} = a_{n+2} a_{n+5}\) implies a periodicity in the sequence.

6. Since the sum \(a_1a_2 + a_3a_4 + a_5a_6 = 6\) and this pattern repeats every 6 terms, we can calculate the total number of such groups in the sum \(a_1a_2 + a_3a_4 + \cdots + a_{41}a_{42}\).

7. The total number of terms from \(a_1\) to \(a_{42}\) is 42. Since each group consists of 6 terms, we have \(42 / 6 = 7\) groups.

8. Therefore, the sum \(a_1a_2 + a_3a_4 + \cdots + a_{41}a_{42}\) is equal to \(7 \times (a_1a_2 + a_3a_4 + a_5a_6)\).

9. Substituting the given value \(a_1a_2 + a_3a_4 + a_5a_6 = 6\), we get:
   \[
   7 \times 6 = 42
   \]

Conclusion:
\[
\boxed{42}
\]