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Please explain how the solve the problem in image .......#..........!.......

Please explain how the solve the problem in image .......#..........!.......

Question Image
Grade:11

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
T20 = 1 + 2+ 3+.....+20 /20 = 20* 21/2*20= 21/2
 
Now
 
S210 = sigma (210)
 
 = 21/2 * 20 = 210
 
Hope it helps

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