Dangerous sequence.

Algebra Level 4

6 , 720 , 362880 , ?


The answer is 479001600.

A Former Brilliant Member by A Former Brilliant Member

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2 solutions

Use the formula , n!, and put the values in the multiples of 3. Means , 3!=6, 6!=720,9!=362880 and 12!=479001600.

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brilliant calculater gave me the ans= 479002000!! hows this possible ?? @Calvin Lin can u tell!!

A Former Brilliant Member - 6 years, 8 months ago

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Thanks for reporting this bug, I will look into it.

Calvin Lin Staff - 6 years, 8 months ago

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will i get the points then??

A Former Brilliant Member - 6 years, 8 months ago

I totally over thought this I was thinking (sum of all the digits of the previous number)! So 6,

6!

(7+2+0)!

-->

27!

I mean, it did occur to me that 10888869450418352160768000000 was a kind of long answer, but my creativity was lacking :P

Alex Li - 4 years, 11 months ago

3 ! = 6 6 ! = 720 9 ! = 362880 S o , 12 ! = 479001600 3!\quad =\quad 6\\ 6!\quad =\quad 720\\ 9!\quad =\quad 362880\\ So,\quad 12!\quad =\quad 479001600

Cheers!!:):)

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