Question #4ce0e

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Answer 1 · 2017-02-06T13:54:03

See the entire thought process for solving below:

$2 + 1 + 5 + 2 + 1 + 2 + 3 + 3 + 2$ $2 + 1 + 5 + 2 + 1 + 2 + 3 + 3 + 2$

$(2 + 1) + (5 + 2) + (1 + 2) + (3 + 3) + 2$ $(2 + 1) + (5 + 2) + (1 + 2) + (3 + 3) + 2$

$3 + 7 + 3 + 6 + 2$ $3 + 7 + 3 + 6 + 2$

$(3 + 7) + (3 + 6) + 2$ $(3 + 7) + (3 + 6) + 2$

$10 + 9 + 2$ $10 + 9 + 2$

$(10 + 9) + 2$ $(10 + 9) + 2$

$19 + 2$ $19 + 2$

$21$ $21$