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

  • 2

23

  • 1
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