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Option 2 : Only II and III follow

The least possible Venn diagram for the given statement is as follows,

[ alt="FederalBank FT2 Radhika 20 Aug 2018 D2" src="//storage.googleapis.com/tb-img/production/18/08/FederalBank_FT2_Radhika_20%20Aug%202018_D2.PNG">

Conclusions:

I. Some lights are tubes → False (It is possible but not definite, as no direct relation between the two is given).

II. Some electronic are not tubes → True (As no tube is electronic, so no electronic is also not tubes).

III. Some bulbs are not electronic → True (As no tube is electric and some tubes are bulbs, so part of bulb which is tubes, will not be electronic).

Thus, Only conclusion II and III follow.
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