void wrote:
why total even no. can be 9*10*5
9= from 1 to 9 for hundred position
10=for 10 choice tenth digit position
5= 0,2,4,6,8 possible option unit place
Hi!
This can be one of the possibility. But, it misses the possibility of considering the units place to be odd.
For a number to have an even product, it can be EOO;OEO;OOE;EEO;EEE;OEE;EOE etc.
Thus, the above possibilities are not total number of possibilities.
Hope this helps!