10*9*8*7*6*5*4*3*2*1 = 10! Can this be true?! Why or why not?

Answer 1

Yes it's true. The "exclamation point" means "factorial" in mathematical terms. 10! means you start at 10 and multiply by the next number down until you reach 1.

5! = 5*4*3*2*1

Answer 2

Yes!!!
The expression "x!" means x(x-1)(x-2)(x-3)...1
So 10! means 10(10-1)(10-2)(10-3)(10-4)(10-5)(10-6)(10-7)(10-8)(10-9)=
10*9*8*7*6*5*4*3*2*1=10!,
which means it is correct.

Answer 3

Because the "!" symbol is used to denote a factorial, which is what the sequence 10*9*8*7*6*5*4*3*2*1 indicates. The product of 10! is 3,628,800. The order of the individual factors does not matter, either backwards or forwards.

Answer 4

because 10! means 10 factorial

9! would be 9*8*7*6*5*4*3*2*1, etc

Answer 5

Yep. The symbol ! after a number can be used to indicate the factorial (the product of all integers from 1 to the number).

There are some branches of math (especially probability) where factorials are used very often.
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How many ways are there to arrange the 52 cards in a standard deck?

The first card can be any of 52.
The second card can be any of the remaining 51
(therefore, there are 52*51=2652 ways to arrange the first two cards)

And so on down the line. After N cards, the next can be any one of the remaining (52-N).

The last card will be, of course, the only card left after the first 51 have been 'fixed' (there is only one way to select that card)

therefore, the answer is 52*51*50*...*3*2*1 = 52!
Some number greater than 8x10^67.

Answer 6

Added together they total 55. And 5+5 does equal 10.

Answer 7

Yes that's the meaning of the factorial symbol (!)

Answer 8

It is true, because that is the definition of a factorial.

Answer 9

Its true, simply according to the definition of "!". x! is simply the product of the first x natural numbers.

Answer 10

Sure, that is the definition of factorial.