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Binomial theorem for positive integral Index
Question
The number of distinct terms in the expansion of
(
1
+
3
x
+
3
x
2
+
x
3
7
is
Moderate
Solution
1
+
3
x
+
3
x
2
+
x
3
7
=
(
1
+
x
)
3
7
=
(
1
+
x
)
21
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