Qualification > Math

Additional Math Help HERE ONLY...!

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shan2391:
4 the second part use same method
_*_*_*_ as we have to make a 4digit no.
for the first as it has to b even we have 3 options so 3*_*_*_
for the last as it has to b even we have 2 options left as we used 1 even digit b4 so 3*_*_*2
now we r left with 5 options or digits so 3*5*_*2
now v r left with 4 digits so 3*5*4*4=120

shan2391:

--- Quote from: divineobsidian on June 04, 2009, 03:15:54 pm ---yea what shan said or you can do 7P4 if you have that on your calculator

unfortunately i get 120 on the 2nd question ,not a lot of help but meh. ???

--- End quote ---
i thnk the ans should b 120

Padapop:
The answer IS 120.

_ _ _ _

lets say first _ is 2, so thats one number

2nd and 3rd _ is 5 P 2 = 20

4th can then be 4 or 6 - 2 numbers

1 * 20 * 2 = 40

Remember though that 4 and 6 can also start first so:

40*3 = 120.

I think thats right, no way that can be 240.

shan2391:
archangel can u check da answer again ???

archangel:
ahhhh thanks you guys!
so u mainly have to use permutations huh? okayyy

+ rep for all of u guys  :D

well that was what the answer at the back says =
maybe its the wrong answer printed... lol

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