IGCSE, Edexcel, IB and AP Science Courses | Dr Dabour Hub Academy

1.

If nC3 = nC7, what is the value of n?

10

21

7

4

2.

The sum to infinity of the geometric series 12 + 6 + 3 + 1.5 + ... equals:

18

Infinity

36

24

3.

If (x - 1, x + 2, 3x) form a geometric sequence, the positive value of x is:

4

6

2

3

4.

The sum to infinity of the geometric series 16 + 8 + 4 + 2 + ... equals:

32

64

24

30

5.

The number of terms in the expansion of \((x + 3y)^{10}\) is equal to:

B) 10

C) 11

D) 20

A) 9

6.

The sum of all coefficients in the expansion of \((3x - 2y)^7\) is equal to:

C) 0

D) 128

A) 1

B) \(5^7\)

Lesson 1 Quiz: Counting Principle, Permutations (nPr) and Combinations (nCr)