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Q.

The number of six digits numbers in which digits are in ascending order must be


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a

48

b

84

c

120

d

126 

answer is B.

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Detailed Solution

six-digit number in which
digit is in ascending order.
select 6 digits out of 9
then there is only one way to average it in ascending order.
Total ways= 9C6=9×5×7×6!3!6!=9×8×73×2=84
Hence 2 is the correct option.
 
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