For any positive integer n, the sum of the first n integers equals n(n+1)/2. What is the sum of all the even integers between 99 and 301. Would like a very thorough explanation of this problem. You don't need to follow the formula. Just go by the simple method, i.e, sum = Average* no. of terms Aver...

If n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990. What is least possible value of n? a) 10 b) 11 c) 12 d) 13 e) 14 A lot of integer property questions can be solved using prime factorization. For questions involving divisibility, divisors, ...