Question 843905: consider a jar there are 10 papers numbered 1 to 10. we have to take 2 papers from the jar. what is the probability that 2 numbers are consecutive numbers?
Answer by Fombitz(32388)   (Show Source):
You can put this solution on YOUR website! Look at the possible outcomes.
There are 90 of them.
Ten possible first picks. Nine possible second picks.
(2,1),(3,1),(4,1),(5,1),(6,1),(7,1),(8,1),(9,1),(10,1)
(1,2),(3,2),(4,2),(5,2),(6,2),(7,2),(8,2),(9,2),(10,2)
(1,3),(2,3),(4,3),(5,3),(6,3),(7,3),(8,3),(9,3),(10,3)
(1,4),(2,4),(3,4),(5,4),(6,4),(7,4),(8,4),(9,4),(10,4)
(1,5),(2,5),(3,5),(4,5),(6,5),(7,5),(8,5),(9,5),(10,5)
(1,6),(2,6),(3,6),(4,6),(5,6),(7,6),(8,6),(9,6),(10,6)
(1,7),(2,7),(3,7),(4,7),(5,7),(6,7),(8,7),(9,7),(10,7)
(1,8),(2,8),(3,8),(4,8),(5,8),(6,8),(7,8),(9,8),(10,8)
(1,9),(2,9),(3,9),(4,9),(5,9),(6,9),(7,9),(8,9),(10,9)
(1,10),(2,10),(3,10),(4,10),(5,10),(6,10),(7,10),(8,10),(9,10)
Look for the consecutive numbers in each row.
For all but the first and last row, you have to pairs of consecutive numbers.
There are 10 rows total.
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