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3a2 (ab+bc+ca) =

3a2+3a2bc+3a3c
3a3b+3a2bc+3c
3a3b+3a2bc+3a3c
a3b+abc+a2c
None of these
Additional Questions

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If x = 0.75, then what is the value of the expression (1+x+x2) + x3/(1-x) ?

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