alleryAdding one, two and two, one from the index two row gives which pair?
AThree and three
BFour and four
CSeven and seven
DTwelve and twelve
Answer & Solution
Correct answer: A. Three and three
1. Each new entry sums the neighbouring pair above.
2. One plus two is the same as two plus one.
3. The addition of 1, 2 and 2, 1 in the row for index 2 gives rise to 3 and 3 in the row for index 3.
4. So the answer is three and three.
_Source: syllabus Mathematics, Ch 7 'Binomial Theorem'_
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