Determine the sum of all the coefficients in the expansions of (a) (x + y)3 (b) (x

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Determine the sum of all the coefficients in the expansions of
(a) (x + y)3
(b) (x + y)10
(c) (x + y + z)10
(d) (w + x + y + z)5
(e) (2s - 3t + 5u + 6v - 11w; + 3x + 2y)10
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