alleryAfter finding the pattern, we can write the expansion to any positive integral:
ARatio
BDigit
CAngle
DIndex
Answer & Solution
Correct answer: D. Index
1. The restriction on the power is the same as at the start.
2. Any whole positive power becomes reachable.
3. We are now in a position to write the expansion of a binomial to any positive integral index.
4. So the answer is index.
_Source: syllabus Mathematics, Ch 7 'Binomial Theorem'_
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