Question

If abc is a three-digit number, proof that abc+bca+cab is a multiple of 111.

Answer 1

Hiya here's your answer -

Assume ABC as any three digit no. which is multiple of 111 like - 777

Then,
ABC+BCA+CAB=?
777+777+777=2331
which is a multiple of 111.

hence proved

hope it helps...........