Question 9 Exercise 7.2
Solutions of Question 9 of Exercise 7.2 of Unit 07: Permutation, Combination and Probablity. This is unit of A Textbook of Mathematics for Grade XI is published by Khyber Pakhtunkhwa Textbook Board (KPTB or KPTBB) Peshawar, Pakistan.
Q9 Find numericalty greatest term in the expansion (x−y)="(x−y)=" when x=12x=12 and y−4y−4. Solution: When we put x=12x=12, then the give becounes (xy=20(12−y)20=122n(1y12)31
Now we theck (n+1)⋅x1+|x| for (112)2⋅ Here n=20 and |x′=|−y12|=13 for y=4 ⇒(n+1);41+|x|=(20+1)⋅131+13 7⋅34=214=5+0.25=p+F.
Thus 5+1=6tt of the 12201(1−y12)20 is greatest i.c. T6=1220⋅2(0!(20−5)!5!⋅(−y12)5
For y=4, it becomes T6=122020!15!5!⋅(−13)2=T6−1220⋅1−1)5⋅20!15!5!⋅135=T6=−1220⋅15504⋅1243=−24460335÷54230.438655932 K.
Ilenec this term Tκ is numerically greates writlen abeve
Go To