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Mathematics
Mathematics
Problem
For a positive integer
p
p
p
, the sum
∑
k
=
3
p
+
2
4
\displaystyle\sum_{k=3}^{p+2} 4
k
=
3
∑
p
+
2
4
equals a)
4
p
+
4
4p+4
4
p
+
4
b)
4
(
p
−
1
)
4(p-1)
4
(
p
−
1
)
c)
4
p
4p
4
p
d)
4
(
p
+
2
)
4(p+2)
4
(
p
+
2
)
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