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Byju's Answer
Standard XI
Mathematics
Intersection
If a n + b ...
Question
If
a
n
+
b
n
a
n
−
1
+
b
n
−
1
is the A.M. between
a
and
b
, then find the value of
n
.
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Solution
According to the given condition,
Given is the A.M between a and b, therefore,
a
+
b
2
=
a
n
+
1
+
b
n
+
1
a
n
+
b
n
a
+
b
2
=
a
n
×
a
+
b
n
×
b
a
n
+
b
n
Cross multiply.
a
n
×
a
+
a
n
×
b
+
b
n
×
a
+
b
n
×
b
=
2
a
n
×
a
+
2
b
n
×
b
a
n
b
+
b
n
a
=
a
n
a
+
b
n
b
a
n
b
−
a
n
a
=
b
n
b
−
b
n
a
a
n
(
b
−
a
)
=
b
n
(
b
−
a
)
a
n
=
b
n
a and b can only be equal if n=0. (
x
n
=
1
)
Thus,
n
=
0.
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2
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Intersection
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