Question

if np3 =1320 find n​

Answer 1

np = 1320÷3

np = 440

so both of them are of half so

n = 440÷2

n = 220

Answer 2

Answer:

67

Step-by-step explanation:

Sep 26, 2018 - NCr=n!/((n-r)!r!), nPr=n!/(n-r)! nCr=nPr/r! nCr*r!=nPr 220*r!=1320 r!=6 r=3 nP3=n!/(n-3)!=1320 n*(n-1)*(n-2)=1320 n^3-3n^2+2n=1320 ...