AIEEE Exam

The coefficient of x^50 in (1 + x)^41 (1 – x + x^2
)^40 is

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AIEEE Other Question

In an infinite G.P., each term is 5 times the sum
of all the successive terms then common ratio of
this G.P. is -
(A) r = 2 (B) r = 1/2
(C) r = 1/6 (D) r = 6
If angle of incidence increases, angle of reflection-
(1) Increase (2) Decrease
(3) Remains same (4) Can not say