NCERT Class 11 Mathematics Solutions: Chapter 8 – Binomial Theorem Miscellaneous Exercise Part 5 (For CBSE, ICSE, IAS, NET, NRA 2023)
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1. Find an approximation of using the first three terms of its expansion.
Answer:
(Approximately)
So, the value of is approximately .
2. Find , if the ratio of the fifth term from the beginning to the fifth term from the end in the expansion of
Answer:
In the expansion,
Fifth term from the beginning
So, it is evident that in the expansion of the fifth term from the
… . eq (1)
… eq (2)
It is given that the ratio of the fifth term from the beginning to the fifth term from the end is .
Therefore, from (1) and (2) ,
So, the value of is .