Question

Can you find the sum of all the digits in integers from one and a billion. Note that's all the digits in all the numbers, not all the numbers themselves. Answer in in teger​

Answer 1

Answer:

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Step-by-step explanation:

405000o0001

Here you have to write all the numbers from 0 to 999999 down as six digit numbers (possibly prepending zeros) then all digits appear the same number of times.

So, its digit appears exactly 6 x 1000000/10 = 600000 times. so the result is 600000x 45 +1 (+1 for the number 1000000). In this way you can find the sum.