2n is 2 times n.
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5 - 2n = 1 4 = 2n n = 2
'n' can be any number, but when applied to (2n + 4), n = 2.5
This indicated the difference between a haploid and a diploid, or rather if a cell has 1 or 2 sets of chromosomes. N = Haploid (A gamete or sex cell) 2N = Diploid (Somatic cell)
A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges. 12 - 8 = 4
Let the middle number of the three be n. Then the three consecutive numbers are n-1, n, n+1. Their sum is n-1 + n + n+1 = 3n Their average is 3n / 3 = n The difference between their sum and their average is 3n-n = 2n 2n = 156 => n = 78. Thus the three numbers are 77, 78, 79