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Q.

The number of  7 – digit numbers are

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a

10000

b

100000

c

900000

d

9000000

answer is D.

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Detailed Solution

The largest 7 – digit number = 9999999

The smallest 7 – digit number = 1000000

Number of all 7 – digit numbers

=9999999-1000000+1

=8999999+1=9000000

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