If R is closed and U is open, which of the following must be true ?
The mixing vat in a factory receives liquid ingredients through six separate valves -- labeled R, S, T,
U, Y and Z - each of which has exactly two settings: Open and closed. The mixing vat operator must
ensure that each valve is set open or closed according to the following conditions:
1. If T is open, both S and Z must be closed; 2. R and Z cannot both be closed at the same time;
3. If Y is closed, Z must also be closed; 4. S and U cannot both be pen at the same time.
সঠিক উত্তর: Option C
Solution:
প্রশ্নে বলা হচ্ছে যে, R বন্ধ থাকলে এবং U খোলা থাকলে নিচের কোনটি অবশ্যই সত্য হবে ?
2. নং শর্তানুযায়ী R এবং Z একই সাথে বন্ধ থাকবে না । R বন্ধ থাকলে Z খোলা থাকবে । আর 1. নং শর্তকে ঘুরিয়ে
লিখলে লেখা যায় S এবং Z খোলা থাকলে T অবশ্যই বন্ধ থাকবে ।
