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4thtriangularnumber
<-- Enter triangular number statement
Calculate triangular number 4
The formula for triangular number n is as follows
T
n
=
n(n + 1)
2
Given n = 4, we have:
T
4
=
4(4 + 1)
2
T
4
=
4(5)
2
T
4
=
20
2
T
4
=
10
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