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If (1 + x + x^(2) + x^(3))^(n)= a(0) + a...

If `(1 + x + x^(2) + x^(3))^(n)= a_(0) + a_(1)x + a_(2)x^(2) + a_(3) x^(3) +...+ a_(3n) x^(3n)`, then the
value of `a_(0) + a_(4) +a_(8) + a_(12)+….. ` is

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A DAS GUPTA-Integrated Tests-Exercise
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  18. If (1 + x + x^(2) + x^(3))^(n)= a(0) + a(1)x + a(2)x^(2) + a(3) x^(3) ...

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  19. If the parabolas y^2=4a x and y^2=4c(x-b) have a common normal other t...

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