A seven digits number with distinct digits is in form of $ab c d e f g$ . ( $g, f, e$ etc are digits at units, tens, hundred plane etc.) where $a < b < c < d < e < f < g$ . The number of such numbers are:

1981

2009

1560

1870

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A seven digits number with distinct digits is in form of

ab c d e f g

. (

g, f, e

etc are digits at units, tens, hundred plane etc.) where

a < b < c < d < e < f < g

. The number of such numbers are:

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Question Text

A seven digits number with distinct digits is in form of

ab c d e f g

. (

g, f, e

etc are digits at units, tens, hundred plane etc.) where

a < b < c < d < e < f < g

. The number of such numbers are:

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