Answer
a.1
b.2
c.-4
d.0
e.-2
Work Step by Step
a. Σ ai from 0 to 6=a0+a1+a2+a3+a4+a5+a6=
2+3-2+1+0-1-2=1
b.Σ a- from 0 to 0=a0=2
c. Σ a2j from 0 to 3 = a(2*1)+a(2*2)+a(2*3)=
a2+a4+a6=-2+0-2=-4
d.兀 from 0 to 6 = a0*a1*a2*a3*a4*a5*a6=
2*3*-2*0*1*2*-1=0
e.兀 from 2 to 2 = a2=-2