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CBSE Class 11-science Answered


The 3rd, 4th and 5th terms in the expansion of are respectively 84, 280 and 560.Find numbers of terms of expansion?

Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
By binomial theorem:
Now,
                                                                       
From (1) and (2) we get,
Answered by | 04 Jun, 2014, 03:23: PM
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