Solution
4, 196, 16, 144, 36, 100, 64, (…)
it contains two series
4, 16, 36, 64 (1)
196,144,100,(...) (2)
first one is square of even nos
$$2^2,4^2,6^2,8^2$$
second one is decreasing order ofeven nos squares
$$14^2,12^2,10^2,8^2$$
so ans is $$8^2= 64$$
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