wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

nP4=20× nP2 find n

Open in App
Solution

Given that:

np4=20×np2

n!(n4)!=20×n!(n2)!

(n2)(n3)(n4)!=20×(n4)!

n25n+6=20

n25n14=0

n27n+2n14=0

(n7)(n+2)=0

n=7,2(Not considerable)

Hence, n=7


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Laws of Indices
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon