# Complementary Combination Quiz Questions and Answers 124 PDF Download

Learn complementary combination quiz, online college math test 124 for online courses, distance learning. Free math MCQs questions and answers to learn complementary combination MCQs with answers. Practice MCQs to test knowledge on complementary combination, fourth root of unity, composition of functions, double angle identities, online math learning for online college education with interactive tests.

Free complementary combination course worksheet has multiple choice quiz question as value of ^{n-1}c_{r} + ^{n-1}c_{r-1} is with options ^{n+1}c_{r}, ^{n-1}c_{r}, ^{n}c_{r-1} and ^{n+1}c_{r+1} with problems solving answer key to test study skills for online e-learning, viva help and jobs' interview preparation tips, study permutations, combinations & probability multiple choice questions based quiz question and answers.

## Quiz on Complementary Combination Quiz PDF Download Worksheet 124

Complementary Combination Quiz

MCQ. Value of ^{n-1}C_{r} + ^{n-1}C_{r-1} is

^{n+1}C_{r}^{n-1}C_{r}^{n}C_{r-1}^{n+1}C_{r+1}

B

Fourth Root of Unity Quiz

MCQ. One root of equation x² + 1 = 0 is ι other is

- −ι
- ι²
- −1
- None of Above

B

Composition of functions Quiz

MCQ. If ƒ(x) = √(cot^{-1}x and g(x) = lnx,then (fog)(x) =

- ln(cot
^{-1}x) - 1/2 ln(cot
^{-1}x) - cot
^{-1}(lnx) - √(cot
^{-1}(lnx)

D

Double Angle Identities Quiz

MCQ. Cos2α =

- cos²α - sin²α
- 2sin²α +1
- 2sin²α -1
- 2cos²α +1

A

Online Math Learning Quiz

MCQ. Cos7θ-cosθ =

- 2sin4θsin3θ
- −2sin4θsinθ
- −2sin4θcosθ
- 2sin4θcosθ

B