If 10Cx-1 > 2 × 10C3, then
(a) x = [1,10]
(b) x = (7, infinity)
(c) x = {1,2,3}
(d) x= {8,9,10}
Answers
Answered by
2
Answer:
option is
B
8
10
C
x−1
>2.
10
C
x
(x−1)!(10−x+1)!
10!
>2×
x!(10−x)!
10!
(x−1)!(11−x)!
1
>
x(x−1)!(10−x)!
2
(11−x)(10−x)!
1
>
x(10−x)!
2
11−x
1
>
x
2
x>22−2x
3x>22
x>
3
22
x>7.33
x≥8
∴ Least integral value of x=8
Was this answer helpful?
Similar questions