Time and Tense |one shot

Time & Tense

Time And Tense - Combinations|OMR

8 clay targets are arranged as shown. If N be the number of different way they can be shot (one at time) if no target can be shot until the target(s) below it have been shot. Find the ten's digit of N.

Atul can hit a target 3 times in 6 shots, Bhola can hit the target 2 times in 6 shots and Chandra can hit the 4 times in 4 shots. What is the probability that at least 2 shots (out of 1 shot taken by each one of them) hit the target ?