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If p = -2, q = - 1 and r = 3, find the v...

If p = -2, q = - 1 and r = 3, find the value of
(i) `p^(2) + q^(2) - r^(2)`
(ii) `2p^(2) - q^(2) + 3r^(2)`
(iii) p - q - r
(iv) `p^(3) + q^(3) + r^(3) + 3 pqr`
(v) `3p^(2) q + 5pq^(2) + 2 pqr`
(vi) `p^(4) + q^(4) - r^(4)`

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