If a <1, then 1 + a + a2 + a3 +__ is
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Step-by-step explanation:
a
1
+
a
2
1
=
a
1
+
a
2
1
×
a
1
−
a
2
a
1
−
a
2
=
a
1
−a
2
a
1
−
a
2
=
d
a
1
−
a
2
Similarly =
d
1
(
a
1
−
a
2
)
a
2
+
a
3
1
=
d
a
2
−
a
3
=
d
1
(
a
2
−
a
3
)
a
3
+
a
4
1
=
d
a
3
−
a
4
=
d
1
(
a
3
−
a
4
)
a
4
+
a
5
1
=
d
a
4
−
a
5
=
d
1
(
a
4
−
a
5
)
a
n−1
=
a
n
1
=
d
a
n−1
−
a
2
=
d
1
(
a
1
−
a
6
)
d
1
(a1 −an ) root
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