Question

we need to create serial numbers that start with on of the letters A B C D or F followed by three non-repeating digits how many serial numbers can be created?

Answer 1

please help

Answer 2

its 399900.

Answer 3

how did you get that

Answer 4

look,,,,,,,we hav to start with a,b,c,d,f..so their r only 5 ways to get 1st letter.Now for 2nd letter we hav only 21 wys as 26letters-(a,b,c,d,f)=21lettrs left. For 3rd v hav only 20 ways as 26-(a,b,c,d,f)-2nd lettr used. Like as for 4th lettr v hav only 19 ways.
thus"- total seriel no that can b get are.... 5*21*20*19=399900..

Answer 5

is it right..?????

Answer 6

no its not right you have to use numbers along with the letters a b c d f and the numbers can not repeat

Answer 7

ok then it wl b 5*10*9*8=3600

Answer 8

how do you get the 10 9 8

Answer 9

v hav to use no. na