The value of n from the triangle = 2.5
Calculation of perimeter of triangle
Perimeter of a triangle= a +b+c
Where,
a= n
b= 5n - 6
C= 2n + 1
P= 15
Therefore n
15 = n + 2n + 1 + 5n - 6
15 = 8n-5
8n= 15+5
8n = 20
n= 20/8
n= 2.5
Therefore, the value of n = 2.5
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