plus 4, minus 3
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You add the 2 numbers before e.g. 2+3=5
0, 1, 1 (0+1), 2 (1+1), 3 (2+1), 5 (2+3), 8 (3+5), 13(5+8), 21 (13+8), 34 (21+13),....and so on.
it is basically a pattern e.g. 1 2 3 4 5 6 7 8 9 10 11 1 2 1 3 1 4 1 5 1 6 3 1 4 1 5 9 2 6 5 3 5 8 9 7 9
1+1=2 1+2=3 2+3=5 3+5=8 5+8=13 8+13=21 13+21=34 and so on. In each case, n=n becomes the next additional calculation.
5/(√3 - 1)= 5(√3 + 1)/(√3 - 1)(√3 + 1)= (5√3 + 5)/[(√3)2 - 12)= (5√3 + 5)/(3 - 1)= 5√3 + 5)/2= 5√3/2 + 1/2