WISE
Maths
Question No. 18
25 pr is
The value of 24 pq x
5p?
129
O
A)
10 par
B)
10r
O
C)
10 pr
D)
10r/p
Clear Response
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Answer:
10P
r
=720
⇒
(10−r)!
10!
=720 [∵
(n−n)!
n!
]
⇒(10−r)!=
720
10!
⇒(10−r)!=
720
3628800
⇒(10−r)!=5040
⇒(10−r)×(9−r)×(8−r)×.....×1=7×6×5×4×3×2×1
⇒10−r=7
⇒r=10−7=3
or
⇒9−r=6
⇒r=9−6=3
Hence r=3
Answer:
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