what is a number that can be divided by 3 and have a reminder of 1 , the same number and divided 4 reminder of 1 , same number divided by 5 and reminder of 1 , same number and divided by 6 and reminder of 1 , same number and divided by 7 and reminder of 1?
LCM of 3,4,5,6 and 7 is 840
Add 1 (which is the remainder in each case) to 840, we get
840+1=841, this is the answer