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find the difference between
P and P
6 4 6 1
how you do thissssssssssssssss
if u understand what it means by the way i wrote it
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now understand ?????
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helllllllp anyone get how ot do this?
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You gotta give us a chance to respond.
Do you know what permutations are? Do you know the formula for permutations?
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
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yeah i saw in book it is ........like this
10P4 = 10 * 9 * 8 * 7 = 5040
then
4 * 3 * 2 * 1
then divide
10 * 9 * 8 * 7
---------------- = 210
4 * 3 * 2 * 1
like this right?
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formula equals
n(n-1)(n-2)(n-3)...(n-r+1) n!
nCr =----------------------------------- = -------
r! (n-r)!r!
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You got nCr right. Now you gotta come up with a formula for nPr. Trying to do it yourself can be very hard, and it's more often just given to you:
nPr = n! / (n-r)!
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
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ok sooooooooooooo
6P4 = 6! / (6 - 4) ! >>> 6! / 2!
and
6P1 = 6! / (6 - 1) ! >>> 6! / 5!
so tehy ask for the difference
the difference is ........... obvious right
Last edited by Neha (2006-10-30 04:44:00)
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ok so ........
6! / 2! equals
720 / 2 which equals 360
and
6! / 5! equals
720 / 120 which equals 6
and they say find teh difference
then teh difference is 360 subtract 6 which then we have 354 .
Desi
Raat Key Rani !
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thanks unique...that looks right
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so such as this
FIND:
4P2
4P2 = n! / (n-r)!
4P2 = 4! / (4 - 2) !
4P2 = 4! / 2!
4P2 = 12
answer is 12
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