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Find the value of n such that nP5=42 x...

Find the value of n such that
`nP_5=42 xx nP_3,n>4`

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MAXIMUM PUBLICATION-PERMUTATION AND COMBINATIONS-EXAMPLE
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  3. Find the value of n such that nP5=42 xx nP3,n>4

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  4. Find the value of n such that (n-1)P3 : nP4=1:9

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  6. Find the value of r if 5Pr = 6P(r-1)

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