binomial theorem question
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1
here's the answer :)
hope it's a little helpful and understandable since I used factors here.
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★Given :
- The coefficients of 5th,6th&7th terms in the expansion of (1+x)ⁿ are in AP.
★To find :
- Value of n.
★Solution :
We know,
According to question,
are in AP.Then,
And we know,
Substituting these in equation 1,
∴ The value of n is 14 or 7.
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