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7thtriangularnumber
<-- Enter triangular number statement
Calculate triangular number 7
The formula for triangular number n is as follows
T
_{n}
=
n(n + 1)
2
Given n = 7, we have:
T
_{7}
=
7(7 + 1)
2
T
_{7}
=
7(8)
2
T
_{7}
=
56
2
T
_{7}
=
28
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