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Mathematics
Mathematics
Problem
12. Find the
20
th
20^{\text {th }}
2
0
th
term of the series
2
×
4
+
4
×
6
+
6
×
8
+
…
+
n
2 \times 4+4 \times 6+6 \times 8+\ldots+n
2
×
4
+
4
×
6
+
6
×
8
+
…
+
n
terms.
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