magic sum of Whole number 1to n th

Sum of 1 to 10 = 55 sum of 11 to 20 =155 sum of 21 to 30 = 255 …………………………………………………………………

Sum of 91 to 100 = 955

Sum of 1 to 10 = 55

Sum of 1 t0 100 =5050

Sum of 1 to 1000 =500500 

Sum of 1 to 10000 =50005000

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Sum of 1 to 10000000000000000000 =500000000000000000005000000000000000000

 Sum of 1  to100 =5050

Sum of 101 to 200 =15050

Sum of 201 to 300 =25050

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Sum of 901 to 1000 =95050

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Sum of 1 to 10000000000  =5000000000500000000

Sum of 100000000001 to 20000000000  =15000000000500000000

Sum of 2000000001 to 30000000000  =25000000000500000000

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Sum of 90000000001 to 100000000000  =95000000000500000000

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