If \(a = \;\sqrt {135 + \sqrt {74 + \sqrt {43 + \sqrt {36} } } } \) and \(b = \;\sqrt {70 - \sqrt {41 - \sqrt {22 + \sqrt 9 } } } \) , then find the ratio (a + b) ∶ (a - b).

1
1 ∶ 5
2
10 : 3
3
5 ∶ 1 
4
3 : 10

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