यदि 9P+ 5. 9P4 = 10Pr है तो r का मान क्या है?

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UP TGT Mathematics 2019 Official Paper
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  1. 2
  2. 3
  3. 5
  4. 7

Answer (Detailed Solution Below)

Option 3 : 5
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UP TGT Arts Full Test 1
125 Qs. 500 Marks 120 Mins

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संकल्पना:

क्रमसंचय:

एक समय में 'r' ली गई 'n' चीजों के क्रमसंचयों की संख्या:

गणना:

(10 – r)! = 5 × 4!

(10 – r)! = 5!

r = 5

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