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# Complementary Combination Quiz Questions PDF p. 124

Practice Complementary Combination quiz questions and answers, complementary combination MCQs with answers PDF 124 to practice College Math mock tests for online college programs. Practice Permutations, Combinations and Probability quiz questions with answers, complementary combination Multiple Choice Questions (MCQ) for online college degrees. "Complementary combination Quiz" PDF book: online math learning, double angle identities, composition of functions, fourth root of unity, complementary combination test prep for best online colleges for teaching degree.

"The value of n-1Cr + n-1Cr-1 is", complementary combination Multiple Choice Questions (MCQ) with choices n-1cr, n+1cr, ncr-1, and n+1cr+1 for SAT subject test tutoring. Practice permutations, combinations and probability questions and answers to improve problem solving skills for online college courses.

## Quiz on Complementary Combination

1.

The value of n-1Cr + n-1Cr-1 is

n+1Cr
n-1Cr
nCr-1
n+1Cr+1

2.

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

−ι
ι²
−1
None of Above

3.

If ƒ(x) = √(cot-1x and g(x) = lnx,then (fog)(x) =

ln(cot-1x)
1/2 ln(cot-1x)
cot-1(lnx)
√(cot-1(lnx)

4.

Cos2α =

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

5.

Cos7θ-cosθ =

2sin4θsin3θ
−2sin4θsinθ
−2sin4θcosθ
2sin4θcosθ