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Q: What does find the sum of the digits of each number above mean?

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Any number using each of the digits once will be a multiple of 3: eg 1597864302

34.

the answer is 25 and then if you reverse that it is 52

45

The last digit is always the estimated digit in a number

Related questions

Add the digits together. The sum of the digits of 23 is 5.

Hey mate, its on the box itself just above the barcode (10 digits)

Any number using each of the digits once will be a multiple of 3: eg 1597864302

the sum of individual digits of a given integer number

100000 2847239582

The no. is 35.

It is the number of combinations of four numbers where the number of available digits starts at 10 and reduces by 1 each time.

This problem can be solved by applying the counting principle to digits in consecutive page numbers. To begin, we need to separate numbers into their numbers of digits in order to multiply the page numbers to find the number of digits needed to express them. Assuming that your book begins on page 1, there are 9 page numbers having one digit only (counting principle: 9 - 1 + 1 = 9). Since each of these pages is numbered with one digit, the number of digits used is 9 so far. Continue with the pages each numbered with two digits. These are pages 10-99, comprising 90 pages (99 - 10 + 1 = 90). Every page number multiplied by 2 digits each is 180. With the 9 digits coming from single-digit pages, the number of digits used so far is now 189. We can continue in the same manner for pages expressed with three digits, 100-999, but having 435 (624 total - 189 so far = 435) digits left, we probably won't be able to get through all the three-digit numbers. Also, a book is likely to have under a thousand pages. To find out how many pages are left, we divide the number of digits left by the number of digits needed for each page: 435/3 = 145 pages left. Since 145 pages only account for the pages numbered with three digits each, we need to add pages numbered with one and two digits each in order to find the total number of pages. Before 145 pages began to be accounted for, we had accounted for the digits of 99 pages (each numbered using one or two digits each), so the total number of pages is 99 + 145 = 244.

45

There are about 10-11 digits in a number

You had me until "product." The product of 4 digits can't be prime.

26

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