TCS Company Logical Reasoning Coding Decoding

If DDMUQZM is coded as CENTRAL then RBDJK can be coded
as?

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TCS Other Question

Find the value of @@+25-++@16, where @ denotes square and + denotes square root and - has its usual meaning A circular dartboard of radius 1 foot is at a distance of 20 feet from you. You throw a dart at it and it hits the dartboard at some point Q in the circle. What is the probability that Q is closer to the center of the circle than the periphery?
0.20
1
0.5
0.25