How many three-digit numbers can be generated from `1, 2, 3, 4, 5, 6, 7, 8, 9` such that the digits are in ascending o

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Q 2423534441.     How many three-digit numbers can be generated
from `1, 2, 3, 4, 5, 6, 7, 8, 9` such that the digits are in
ascending order?
IAS 2009 Prelims
A

`80`

B

`81`

C

`83`

D

`84`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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