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1)

If  $p\oplus q$ $=p^{2}+q^{2}$$-p-q$ and $p=pq-p-q$ then

$(6\oplus 5)\triangle 5=$

Answer:

Option C

Explanation:

$6\oplus 5$ $=6^{2}+5^{2}-6-5$ $=36+25-6-5$ $=50$

$(6\oplus 5)\triangle 5$ $=50\triangle 5$ $=50\times 5-50-5$ = 195