35 is the answer
35 is the number between 1 and 49 (inclusive) such that the sum to the left of it is equal to the sum to the right of it = 595
the sum of the number between 1 and 34 =595
the sum of the number between 34 and 49 =595
so, 35 is the answer
Is it possible to write down 1,2,3..100 in some order (one after an other), such that the sum of any two adjacent numbers is a prime number?
Using the digits 1, 2, 3 and 4, find the number of 10-digit sequences that can be written so that the difference between any two consecutive digits is 1.
Examples of such 10-digit sequences are ********** and **********.
4 _ 4 _ 4 _ 4 = 20 In the equation, you can see that there are three blank spaces between four 4's.
You have to insert signs (+ -* /) between them in such a manner that the result equals 20.