The 100th pyramidal number is 338,350. that would make quite a stack of basketballs! What number must you add to get 338,350 to the 101st pyramidal number?
lets look a pyramid numbers we have 1st=1 2nd=2 3rd=6 we notice that we jsut add the previous number on so 1st=1 2nd=1+1 3rd=1+2+3 4th=1+2+3+4 so therefor to get from 100th to 101th, just add 101
