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misterJJ2u
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bkk145
misterJJ2u
How many 7 digit numbers are even and have a "3" in the hundreds place? (the number cannot start with a "0").

ABCDEFG
E can only be 3 => 1 possibility
A cannot be 0, has total of 9 possibilities
G can be 2,4,6,8,0 => 5 possibilities
the rest has 10 possibilities

Ans = 9*10*10*10*1*10*5


exactly the same approach.

= 9x10x10x10x1x10x5
= 45 10^4



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