Question
$A, B, C, D, E $ पांच समतलीय बिन्दु हैं, तब $\overrightarrow {DA} + \overrightarrow {DB} + \overrightarrow {DC} + \overrightarrow {AE} + \overrightarrow {BE} + \overrightarrow {CE} $ =
$\overrightarrow {DA} + \overrightarrow {DB} + \overrightarrow {DC} + \overrightarrow {AE} + \overrightarrow {BE} + \overrightarrow {CE} $
=$(\overrightarrow {DA} + \overrightarrow {AE} ) + (\overrightarrow {DB} + \overrightarrow {BE} ) + (\overrightarrow {DC} + \overrightarrow {CE} )$
= $\overrightarrow {DE} + \overrightarrow {DE} + \overrightarrow {DE} $=$3\overrightarrow {DE} .$
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