\(\sum_{r=0}^{n} {}^{n}C_r=2^n\) किस combinatorial idea से निकला है?
The identity \(\sum_{r=0}^{n} {}^{n}C_r=2^n\) is derived from which combinatorial idea?
Correct answer and explanation
Correct Answer
B. हर वस्तु को चुनना या न चुननाSelecting or not selecting each object
Simple Explanation
Left side all possible selection sizes को जोड़ता है और right side हर object के two choices देता है। परीक्षा में subset counting से यह identity याद रखें। / The left side adds all selection sizes and the right side gives two choices for each object. In exams remember this identity through subset counting.
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