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 | 4th Jun, 2014, 01:23: PM

Expert Answer:

By binomial theorem:
Now,
                                                                       
From (1) and (2) we get,

Answered by  | 4th Jun, 2014, 03:23: PM