Question

The number of ways in which 9 things can be divided into twice groups containing 2,3 and 4 things respectively is ?

Answer 1

Solution:-
The total number of things = 9
Forming the first group by choosing 2 things out of 9 things, the total number of ways will be = 9c₂
Now, forming the second group by choosing 3 things out of remaining 7 things, the total number of ways = 7c₃
And forming the third group by choosing 4 things out of the remaining 4 things, the total number of ways = 4c₄
Therefore, the total number of ways = 9c₂ × 7c₃ × 4c₄
(9*8)/(2*1) × (7*6*5)/(3*2*1) × (4*3*2*1)/(4*3*2*1)
72/2 × 210/6 × 1
36 × 35
= 1260 ways
Answer.

Answer 2

Answer:

(B) ------> 1260

I HOPE THAT YOUR DOUBT GOT FULLY CLEARED

PLEASE MARK ME AS BRAINLIEST