If a0,a1,a2,.... be the coefficients in the expansion of (1+x+x2)n in ascending powers of x, also if E1=a0+a3+a6+...,E2=a1+a4+a7.... and E3=a2+a5+a8+...; then:
A
E1=E2=E3
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B
En=3n−1
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C
Both A & B
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D
none of the above
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