perplexus.info :: Probability : Fixed Row, Random Draw

Fixed Row, Random Draw (Posted on 2010-05-14)

Determine the probability that a number randomly drawn from the row of Pascal's Triangle having precisely 128 numbers is divisible by the 127th number (reading left to right) in that row.

Submitted by K Sengupta

Rating: 3.5000 (2 votes)

Solution: (Hide)

127 being prime,all coefficients in the 128 th row,safe the first and the last, will be divisible by 127.
Consequently, the required probability is 126/128=~98.44

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
re(3): 2 easy, we try harder-- who,what,why	broll	2010-05-16 03:02:30
re(2): 2 easy, we try harder-- who,what,why	Ady TZIDON	2010-05-15 10:15:48
re: 2 easy, we try harder	broll	2010-05-15 02:58:51
2 easy, we try harder	Ady TZIDON	2010-05-14 15:03:50
Sol	Andre	2010-05-14 14:18:33

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