if np3 =1320 find n
Answers
Answered by
25
np = 1320÷3
np = 440
so both of them are of half so
n = 440÷2
n = 220
Answered by
10
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 ...
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