Find the sum of 1 + 6 + 11 + – – – 96
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1
Answer:
We can factor our a 6
Hence we are finding
6
(
1
+
2
+
3
+
...
+
16
)
The sum of the first
n
integers is
n
2
(
n
+
1
)
We are doing 6 multiplied by the first 16 integers
Hence we get
6
⋅
16
2
(
16
+
1
)
=
816
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