Find the value of r, if $^{5} P_{r} = 2^{6} P_{r - 1}$

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Solution

r=3 as $1 \leq r \leq 5$

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^{5} P_{r} = 2^{6} P_{r - 1}

^{5} P_{r} = 2^{6} P_{r - 1}

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Find r if (i) (ii) .

Find r if $(i)^{5} P_{r} = 2^{6} P_{r - 1} (i i)^{5} P_{r} =^{6} P_{r - 1}$

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(i)^{5} P_{r} = 2^{6} P_{r - 1} (i i)^{5} P_{r} =^{6} P_{r - 1}

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