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If 16-2=2, 9-3 = 0 , 81-1= 8, then what is 64 - 4 = ?
The pattern followed is that for $$a^2-b=a-b$$
Eg = $$4^2-2=4-2=2$$
and $$3^2-3=3-3=0$$
and $$9^2-1=9-1=8$$
Similarly, $$8^2-4=8-4=4$$
=> Ans - (A)
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