If `a` denotes the number of permutations of `(x+2)` things taken all at a time, `b` the number of permutations of `x` things taken `11` at a time and
If `a`
denotes the number of permutations of `(x+2)`
things taken all at a time, `b`
the number of permutations of `x`
things taken `11`
at a time and `c`
the number of permutations of `x-11`
things taken all at a time such that `a=182b c ,`
find the value of `xdot`
A. 15
B. 12
C. 10
D. 18
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1 Answers
Correct Answer - B
`because a=182bc`
`implies(x+2)!=182xx.^(x)P_(11)xx(x-11)!`
`implies(x+2)!=182xx x!`
`implies(x+2)(x+1)=14xx13` ,brgt `impliesx+1=13`
`thereforex=12`
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