Question: Help needed with math problem below multiple choice The general combinatorial formula for the nth triangular number (1, 3, 6, 10, 15, 21, ...) is

Help needed with math problem below multiple choice

Help needed with math problem below multiple
The general combinatorial formula for the nth triangular number (1, 3, 6, 10, 15, 21, ...) is On+1 Cn Onti Cn-2 O 2n Cn Onti C2

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