(a) Observing the equation we get A = 9
(b) Observing the equation we get B = 5
(c) Observing the equation we get A = 3
(d) Observing the equation we get A = 6 and sum is 2996
(e) Observing the equation we get A = 4, B = 1
By trial and error method we solve the equations.
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(b)