Let s be the sum of all digits used in writing all numbers from 1 to 1010.find s

We know, s = n/2 [a + l ]
Here, n = 1010
a = 1
l = 1010

Substitute their values, 
s = 1010/2 [1 + 1010]
s = 505 [ 1011]
s = 510555

In short, Your Answer would be 5,10,555

Hope this helps!

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)

Agc and bgd are vertical angles