Find the product of the following pairs: \[-3l,\,-2m\]
A.\[61\,m\]
B.\[-61\,m\]
C.\[41\,m\]
D.None of these

Hint: In the multiplication of algebraic functions always start with negative or positive signs. Use the properties of integers and apply it, then multiply the like term. In the case of multiplying in algebra like powers of like terms added.

Complete step-by-step answer:
\[(-3l)\]\[(-2m)\]
Using identity of integers, \[\left( - \right)~\left( - \right)\text{ }=\text{ }\left( + \right)\]
So, \[-3\]\[\times \]\[-2\]\[\times \]\[l\]\[\times \]\[m\]
\[+\text{ }6\text{ }lm\]
For example \[{{x}^{m}}\]\[\times \]\[{{x}^{n}}\]\[=\]\[{{x}^{m+n}}\]
Answer is D

Note: Firstly, understand all the properties of exponent and powers, integers and algebraic expressions for solving such types of questions. It will help a lot.