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Number of Divisors (Important Results)
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This lesson discusses the concept of number of divisors in Permutations and combinations

Vineet Loomba is teaching live on Unacademy Plus

Vineet Loomba
IITian | Best Online Maths Educator | Highest Overall Watch Time | 8+ Years Experience | Youtube: Maths Wallah | vineetloomba.com

Comments
(15)
U
Unacademy user
PR
sir aap itne acche se explain karte ho ki ek baar me hi saare doubt clear ho jate hai...thank you so much sir 🙏 you are a great.
Ap
Sir ye wala topic sahi se nhi samajh me a rha h es topic pe ek aur videos daliye sir
one question put me in trouble ,sir the question is The number of 5 digit telephone numbers having atleast one of their digits repeated is .
Mj
Mitali jaju
a month ago
I think answer should be 62784 Total no. of 5 digit no.s with all no.s repeated - total no. of 5 digit no.s with no digit repeated 9X10X10X10X10 - 9X9X8X7X6 90000-27216 =62784 In case you are wondering, 0 cannot be put on ten thousandth place coz then it won't be a 5 digit no. any more...
Mj
Mitali jaju
a month ago
I think answer should be 62784 Total no. of 5 digit no.s with all no.s repeated - total no. of 5 digit no.s with no digit repeated 9X10X10X10X10 - 9X9X8X7X6 90000-27216 =62784 In case you are wondering, 0 cannot be put on ten thousandth place coz then it won't be a 5 digit no. any more...
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