1.

(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......

A. $\frac{{n\left( {n + 1} \right)}}{2}$$
B. $\frac{{n\left( {n - 1} \right)}}{2}$$
C. ${n^2}$$
D. $n$$
Answer» C. ${n^2}$$


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