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Count To A & Count To B

Algebra Level 3

\[ (1+2+3+\cdots+ A) + (1+2+3+\cdots + B) + (A \times B )= \, ? \]

\[ 1 + 2 + 3 + \cdots + (A+ B) \] \[ 1 + 2 + 3 + \cdots + (A\times B) \]

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by Agnishom Chattopadhyay

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