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The general rule for expansion is built using the concept of:
AConnections
BCombinations
CCollections
DCorrections
Answer & Solution
Correct answer: B. Combinations
1. It avoids writing out every earlier row.
2. The idea was studied in an earlier chapter.
3. It uses combinations.
_Source: NCERT Class 11 Mathematics, Ch 7 'Binomial Theorem'_
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