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5thtriangularnumber
<-- Enter triangular number statement
Calculate triangular number 5
The formula for triangular number n is as follows
T
n
=
n(n + 1)
2
Given n = 5, we have:
T
5
=
5(5 + 1)
2
T
5
=
5(6)
2
T
5
=
30
2
T
5
=
15
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