Question

Which of the following demonstrates how the 70 is calculated using the combination pattern? 1 1 2 1 3 3 6 5 10 10 5 6 15 20 15 21 35 35 21 28 56 56 28 8 1

Answer 1

To solve this question, use the combination formula:

`_nC_r=(n!)/(r!(n-r)!)`

Where r items are selected from a set of n items.

In this question,

r = 2

n = 7

Then,