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If 9P5 + 5. 9P4 = 10Pr, then the value of r is

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UP TGT Mathematics 2019 Official Paper
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  4. 7

Answer (Detailed Solution Below)

Option 3 : 5
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Detailed Solution

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Concept:

PERMUTATION:

Number of Permutations of ‘n’ things taken ‘r’ at a time:

Calculation:

(10 – r)! = 5 × 4!

(10 – r)! = 5!

r = 5

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