I'm working on a Koshy's elementary number theory exercise and need help finding all triangular numbers less than 1000 that are palindromic. The problem says as follows: Find all triangular numbers...
1 the number of factor 2's between 1-1000 is more than 5's.so u must count the number of 5's that exist between 1-1000.can u continue?
I sat an exam 2 months ago and the question paper contains the problem: Given that there are $168$ primes below $1000$. Then the sum of all primes below 1000 is (a) $11555$ (b) $76127$ (c) $
A big part of this problem is that the "1 in 1000" event can happen multiple times within our attempt. Compare this to if you have a special deck of playing cards with 1000 cards in it, exactly one of those cards is the ace of spades.
elementary probability - What is the chance that a 1 in 1000 event will ...
The number of bacteria in a culture is 1000 and this number increases by 250% every two hours. How many bacteria is present after 24 hours?
combinatorics - The number of bacteria in a culture is 1000 and this ...
A hypothetical example: You have a 1/1000 chance of being hit by a bus when crossing the street. However, if you perform the action of crossing the street 1000 times, then your chance of being ...
probability - 1/1000 chance of a reaction. If you do the action 1000 ...
First of all, from 99 to 1000, we have 100 to 999, meaning $91010$ since 1 to 9 is 9 numbers. We have 900 numbers. Then, to get all numbers with at least one $7$ in their digits, we can do: All