[" 15.If number of words of "7" letters ...

[" 15.If number of words of "7" letters (with "a,b" and "c" as given letters) which contain an even number of "c's" ,"],[" is "d," so unit digit of "((d+3)!-(d+1)!+5)" is ".........." (all the three letters "a,b" and "c" must be in each "],[" word)."]

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[" 15.If number of words of "7" letters (with "a,b" and "c" as given letters) which contain an even number of "c's" ,"],[" is "d," so unit digit of "((d+3)!-(d+1)!+5)" is ".........." (all the three letters "a,b" and "c" must be in each "],[" word)."]

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