Question

what will be the answer when we add all digits from 1 to 100​

Answer 1

Answer:

5050

Step-by-step explanation:

Method 1:

There is a formula to calculate this

the formula is n/2[2a+(n-1)d]

here n is number of terms, a is first term, d is common difference in an AP

In this AP a is 1 , d is 1 , n is 100

Put values

sum is 100/2[2 + (100-1)1]

50 × 101 = 5050

Method 2:

use direct formula

n(n+1)/2

n is number of numbers

100(100+1)/2 = 100×101/2= 50×101 = 5050

Answer 2

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