Question -
Answer -
Given that we need tofind the no. of ways of obtaining a product by multiplying two or more from thenumbers 3, 5, 7, 11.
Number of ways = (no.of ways of multiplying two numbers) + (no. of ways of multiplying threenumbers) + (no. of multiplying four numbers)
=┬а4C2┬а+┬а4C3┬а+┬а4C4
By using the formula,
nCr┬а= n!/r!(n тАУ r)!
= 12/2 + 4 + 1
= 6 + 4 + 1
= 11
тИ┤┬аThe total numberof ways of product is 11 ways.