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Option 2 : No conclusions follow
The minimum possible Venn diagram of the given statements,
[ alt="RRB Group-D 17th Sep 2018 Shift 1 Q1 to Q100 (1) hindi हिंदी harish 20" src="//storage.googleapis.com/tb-img/production/19/06/RRB_Group-D_17th%20Sep%202018%20Shift%201_Q1%20to%20Q100%20%281%29_hindi_%E0%A4%B9%E0%A4%BF%E0%A4%82%E0%A4%A6%E0%A5%80%20harish%2020.PNG" style="width: 189px; height: 50px;">
Conclusions:
1. All iron are metals → False (it is possible but not definite)
2. All heavy are metals → False (it is possible but not definite)
Hence, no conclusion follows.
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