Question

find the sum of numbers laying between 250 and400 whose hcf is36​

Answer 1

1. The nos. should have 36 in their factorisation , so let them be 36n , 36m and so on.

2. The nos. lie between 250 and 400 so n,m and other variables must be between 7 and 11

3. From 7  , 8 , 9 , 10 , 11 we have to choose nos. with no common factor, so the pairs are => (7,8,9,11) and (7,9,10,11)

36 * 7 = 252

36 * 8 = 288

36 * 9 = 324

36 * 10 = 360

36 * 11 = 396

Rest you can make pairs and find the sum.