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Find
∑
r
=
−
2
2
r
2
−
3
r
+
2
Hence
, find
∑
r
=
−
2
2
5
r
2
−
15
r
+
10
a
f
1
+
a
f
2
+
…
+
a
f
n
=
a
(
f
1
+
f
2
+
…
+
f
n
)