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Answer:
1716 ways
Step-by-step explanation:
Given that :
Number of entrants = 13
The number of ways of attaining first, second and third position :
The number of ways of attaining first ; only 1 person can be first ;
Using permutation :
nPr = n! ÷(n-r)!
13P1 = 13! ÷ 12! = 13
Second position :
We have 12 entrants left :
nPr = n! ÷(n-r)!
12P1 = 12! ÷ 11! = 12
Third position :
We have 11 entrants left :
nPr = n! ÷(n-r)!
11P1 = 11! ÷ 10! = 11
Hence, Number of ways = (13 * 12 * 11) = 1716 ways
Step-by-step explanation:
it is 5/6 ..............
The side is 8 feet = 8*12 inches = 96 inches
Plants are needed if they are to be spaced 8 inches apart around the outside of the bed
96/8 = 12 ... so we need 12 plants on each side, please note it is including the corners.
If we not incluse corner, the flowers will be 10 each side.
Means total flower : 10 * 4 (each side) + 4(corner)
The total needed is 44 plants. : Answer
Hope that will help :)
