If Q is assigned on only one day and R is assigned on four days, which of the following pairs of watchmen must be assigned on Tuesday?
A. P and R
B. P and T
C. Q and R
D. R and S
E. None of these
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Explanation: Q কে একদিন দায়িত্ব দেয়া হলে সে দিনটি অবশ্যই Monday. R কে চারদনি দায়িত্ব দিলে দেখতে হবে পরপর তিনদিন যেন দায়িত্ব না পড়ে। সেটা সম্ভব যদি R Sunday, Monday এবং Wednesday, Thursday কাজ করে অর্থাৎ Tuesday তে R এর থাকা সম্ভব নয়। Answer choice A, C ও D বাদ। এখন Q কে এবং S কে Tuesday তে দেয়া সম্ভব না কারন- এই প্রশ্নে বলা আছে Q শুধু একদিন কাজ করবে। আবার S কে দিলে পরপর তিনদিন হয়ে যায়। অর্থাৎ ওকে Tuesday তে কাজ করতেই হবে। (এলাউ করা সম্ভব না, উত্তরটিতে ভুল আছে)।
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