To get from 8 to 11 we have to add 3 To get from 11 to 14 we have to add 3 The next number will be found by adding 3 to 14, getting 17 8 <-- 8 is not divisible by 10 8+11 = 19 <-- 19 is not divisible by 10 8+11+14 = 33 <-- 33 is not divisible by 10 8+11+14+17 = 50 <-- 50 IS DIVISIBLE BY 10. So adding the very next number, 17, gives 50, a multiple of 10. Edwin