Question

on Monday adian reads 1/3 of a book, on Tuesday he read 1/4 of the remaining pages. to complete the book he needs to read an additional 60 pages. how many pages are in the book

Answer 1

Answer:

We can find the possible numbers to generate using the combinations :

Total=(7/3)∗(4/2)∗(2/1)∗(1/1)

Explanation:

we have 7 possible positions to distribute our 3 two's, hence (7/3)

we have 4 possible positions to distribute our 2 four's, hence (4/2)

we have 2 possible positions to distribute our single zero, hence (2/1)

we have 1 possible position to distribute our single one, hence (1/1)

But since the numbers that start with digit 0 are not greater than 1000000, we will have to subtract them:

NumberStartWithZero=(6/3)∗(3/2)∗(1/1)

Total−NumberStartWithZero=360 (after few calculations)