# There are 100 T shirts arranged in a room sequentially in multiple rows . 20 T-shirts are of blue color and 50 T-shirts are of green color and remaining T-shirts are of Red color . Each row is having 10 T-shirts and in 10 rows all the T-shirts are arranged . In the first row there are T-shirts of 3 different colors . In the first row between two consecutive Blue T-shirts there is a Red T-shirt . A Red T-shirt is not present immediate next to a Green T-shirt or another Red T-Shirt . There are 3 Blue T-Shirt's and 2 Red T-Shirts in the first row . How many possible ways are there for placing 4 Green color T-Shirts sequentially one after the other ?