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Byju's Answer
Standard XII
Mathematics
Arithmetic Mean
Show that 1 ...
Question
Show that
1
u
0
−
1
u
1
+
1
u
2
−
1
u
3
+
⋯
+
(
−
1
)
n
1
u
n
=
1
u
0
+
u
2
0
u
1
−
u
0
+
u
2
1
u
2
−
u
1
+
⋯
u
2
n
−
1
u
n
−
u
n
−
1
.
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Solution
Put,
1
u
r
−
1
u
r
+
1
=
1
u
r
+
x
r
(
u
r
+
1
−
u
r
)
(
u
r
+
x
r
)
=
u
r
u
r
+
1
;
So that
x
r
=
u
2
r
u
r
+
1
−
u
r
and
∴
1
u
0
−
1
u
1
=
1
u
0
+
u
2
0
u
1
−
u
0
;
1
u
0
−
1
u
1
+
1
u
2
=
1
u
0
+
u
2
0
u
1
−
u
0
+
u
2
1
u
2
−
u
1
+
and so on
∴
Sum
=
1
u
0
+
u
2
0
u
1
−
u
0
+
u
2
1
u
2
−
u
1
+
.
.
.
.
.
.
.
.
Suggest Corrections
1
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Show that the infinite series
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−
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b
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3
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