alleryThe sought rule avoids writing which rows of Pascal's triangle?
AAll empty rows
BAll entered rows
CAll earlier rows
DAll equal rows
Answer & Solution
Correct answer: C. All earlier rows
1. Reaching one row by the triangle needs everything above it.
2. A formula would jump straight to the row wanted.
3. The rule helps find the expansion without writing all the rows that come before the desired index.
4. So the answer is all earlier rows.
_Source: syllabus Mathematics, Ch 7 'Binomial Theorem'_
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