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The number of ways of seven digit number...

The number of ways of seven digit number with distinct digits of the form `a_(1)a_(2)a_(3)a_(4)a_(5)a_(6)a_(7),(a_9(i)!=0AAi=1,2,.7)` be present in decimal system such that `a_(1)lta_(2)lta_(3)lta_(4)gta_(5)gta_(6)gta_(7)`

A

`820`

B

`720`

C

`620`

D

`120`

Text Solution

Verified by Experts

The correct Answer is:
B
`.^(6)C_(3).^(3)C_(3)+^(7)C_(3).^(4)C_(3)+^(8)C_(3).^(5)C_(3)=720`
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