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For a hydrogen orbital with n=2n = 2 and l=1l = 1, the expectation value of the radius is r/a0=(1/2)(3n2l(l+1))\langle r\rangle/a_0 = (1/2)(3n^2 - l(l+1)). What is r\langle r\rangle in units of the Bohr radius a0a_0?