Question

find the sum of all natural number from 1 to 100​

Answer 1

5050

Step-by-step explanation:

n(n+1)/2

n=100

100(101)/2

Answer 2

Answer:

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Step-by-step explanation:

the formula is sn=n/2(2a+(n-1)d

                           =100/2(2×1+(100-1)1

                           =50(2+99)

                           =50(101)

                            =5050

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