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Expanding to index twelve by the triangle needs all rows written till index:
ATwelve
BTwenty
CThirty
DThirteen
Answer & Solution
Correct answer: A. Twelve
1. Each row depends on the one before it.
2. Reaching a row means writing every row up to it.
3. This can be done by writing all the rows of Pascal's triangle till index 12.
4. So the answer is twelve.
_Source: NCERT Class XI Mathematics, Ch 7 'Binomial Theorem'_
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