Q. In a row of 36 pupils, the first boy is followed by 1 girl, the second boy is followed by 2 girls, the third by 3 girls and so on. What is the number of girls in the second half of the row ?
The Arrangement WiLL
B, G, B, G, G B, G, G, G, B, G, G, G, G,B,G,G,G,G, G, B, G, G, G ,G, G, G, B, G , G, G ,G,G,G,G,B
I Have Bolded The Second Half
Number of girls = 15