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TOPIC:
Combination and Permutation
Topics
Trigonometry
Complex Numbers
Series and Binomials
Calculus
Locus and Circles
Conic Section
Differential Equations
Combination and Permutation
Descriptive Statistics
Probability theory
Probability Distribution Functions (PDFs)
Question
1
out of
5
\( ^4 P_r=4× ^5 P_{r-1}. \)
Find
r
.
1
3
4
2
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