Find r if (i) (ii) .

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Solution

(i)

It is known that,

∴0 ≤ r ≤ 5

Hence, r ≠ 10

∴r = 3

(ii)

It is known that,

∴0 ≤ r ≤ 5

Hence, r ≠ 9

∴r = 4

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

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