Determine the following sums using a suitable arrangement. Explain the steps in detail.
$18999 + 20001 + 15656$

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Solution

Adding the numbers using grouping
$\begin{array}{rcl} 18999 + 20001 + 15656 & = & (18999 + 20001) + 15656 \\ = & 39000 + 15656 \\ = & 54656 \end{array}$
Hence, sum of $18999 + 20001 + 15656$ is $54656$ .

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