From a sales line of 10 products, how many ‘ subsets of 3 products can be offered to customers ?

The correct answer is (c) 124.

There are 124 ways to choose 3 products from a sales line of 10 products. This can be calculated using the formula $nCr = \frac{n!}{(n-r)!r!}$, where $n$ is the number of items and $r$ is the number of items to be chosen. In this case, $n=10$ and $r=3$, so $nCr = \frac{10!}{(10-3)!3!} = \frac{10 \times 9 \times 8}{(7 \times 6 \times 5) \times 3 \times 2 \times 1} = 124$.

Option (a) is incorrect because it is the number of ways to choose 4 products from a sales line of 10 products. Option (b) is incorrect because it is the number of ways to choose 5 products from a sales line of 10 products. Option (d) is incorrect because it is the number of ways to choose 2 products from a sales line of 10 products.