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The numbers 1,3,6,10,15,21,28."……" are c...

The numbers `1,3,6,10,15,21,28."……"` are called triangular numbers. Let `t_(n)` denotes the bth triangular number such that `t_(n)=t_(n-1)+n,AA n ge 2`.
If `(m+1)` is the nth triangular number, then `(n-m)` is

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