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BODMAS

Find n if : a...

Question

Find n if : (a) n! = 120 (b) n! = 720

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Solution

(a)

∴n = 5

(b)

∴n = 6

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Find n if : (a) n! = 120 (b) n! = 720

{^{n} P}_{r} = 720

{^{n} C}_{r} = 120

r

Q. Find the value of

n

r

^{n} P_{r} = 720

^{n} C_{r} = 120

If $^{n} P_{r} = 720$ and $^{n} C_{r} = 120$ , find the value of r.

^{n} P_{r} = 720

^{n} C_{r} = 120

, then what is the value of 'r'.

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