Find the ODD one out from the given options.
All are the squares of the number
25-81 = $$5^2-9^2 = 9-5 =4$$
36-100 = $$6^2-10^2 = 10-6 =4$$
16-64 =$$4^2 - 8^2=8-4 =4Â $$
49-169 =$$7^2 - 13^2 =13- 7 =6$$
all the first three has same difference
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