I'm getting more and more confused...
The example above was mis-typed, my fault -- on my scratch paper I've got down two 12 digit numbers:
121212121213 (5 twos, 6 ones, and 1 three)
212113211221 (also 5 twos, 6 ones, and 1 three)
Total =
333325332434
= (3+3+2+3+2+3) - (3+3+5+3+4+4)
= 16 - 22
= -6 --> Hence 333325332434 is not a multiple of 11.
Statement 2 is definitely insufficient with this counter-example.
Statement 1, in gmatclubmember's explanation is sufficient. I was doubting it for a second, because he did it only in absolute reverse, but each combination, regardless of how you combine them, is a multiple of 11.
The example above was mis-typed, my fault -- on my scratch paper I've got down two 12 digit numbers:
121212121213 (5 twos, 6 ones, and 1 three)
212113211221 (also 5 twos, 6 ones, and 1 three)
Total =
333325332434
= (3+3+2+3+2+3) - (3+3+5+3+4+4)
= 16 - 22
= -6 --> Hence 333325332434 is not a multiple of 11.
Statement 2 is definitely insufficient with this counter-example.
Statement 1, in gmatclubmember's explanation is sufficient. I was doubting it for a second, because he did it only in absolute reverse, but each combination, regardless of how you combine them, is a multiple of 11.
