2022_IAS_Qn A79. What is the number of numbers of the form 0.XY, where X and Y are distinct

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 What is the number of numbers of the form 0.XY, where X and Y are distinct non-zero digits?
(a)    72
(b)    81
(c)     90
(d)    100
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Thank you sir i am watching your videos continuously, your giving me inspiration to solve these kinds of problems 👍

pavanashreeng
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May you tell when we have to use permutations and combination " It's confusing.. I was using combination here

liton
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4, 8 = 0.48&0.84 y this sir...not use of sum..pls explain

machinetechtamil
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Why not combination is not used here....we are picking/selection here??

AcousticUPSC
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Wont 81 be the answer sir? And another doubt is if the question contains distinct number whether repetition of digits is allowed or not?

santhoshrajac