Index of (r+1)th Term from End When Counted from Beginning
The expansion...
Question
The expansion of (1+x)n has 3 consecutive terms with coefficients in the ratio 1:2:3 and can be written in the form nCk:nCk+1:nCk+2. The sum of all possible values of (n+k) is?
A
18
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B
21
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C
28
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D
32
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