Three consecutive energy groups in an ultrane cross section library have scattering cross sections..

Three consecutive energy groups in an ultrane cross section
library have scattering cross sections of 1, 2, and 3 barns. If the energy
groups have the same width, and they are exposed to a neutron ux of 3 × 108
neutrons/cm2/s, 2 × 108 neutrons/cm2/s, and 1 × 108 neutrons/cm2/s,
respectively, what is the scattering cross section for the collapsed group?

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