Question

If nP4 = 30 nP2. Find n​

Answer 1

Step-by-step explanation:

$n {}^{4} = 30 {n}^{2} \\ {n}^{4 } \div {n}^{2} = 30 \\ {n}^{4 - 2} = 30 \\ {n}^{2} = 30 \\ n = \sqrt{30}$