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Does this kind of problems try to test how quickly you can solve linear equations?
This question gives simple formula with 1 variable (a) and big nos (120, 60, 30, etc..)
The earlier we get this into single no, the quicker you reach to soln.
120 = 120/2^10a + 60
2 = 2^10a
so, 10a = 1 => a=1/10.
2nd sqn with t=10 gives F=75.
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