Question

Rewrite as a single combination:

A) C(14, 7) + C(14, 8)

B) C(17, 15) + C(17, 14)

4) Expand:

A)(2x – 3)⁴

B) (a + 4b)⁷

Answer 1

We would be looking at first question both parts here as:

a) This is expanded as:

Taking LCM of 8!7! here, we get here:

Therefore C(15, 8) is the required expression here. (Which can also be written as C(15,7) )

B) The expression here is expanded as:

Taking 15! 3! as the LCM, we get here:

Therefore C(18, 15) is the required expression here. (Which can also be written as C(18,3) )