Mental Floss

Brain Game: The 101

By BY
facebooktwitterreddit

Today's Brain Game will be easy to solve with a spreadsheet program, but try it without. Remember, we're here to exercise your brain, not your computer skills. Good luck!

How many positive three-digit numbers are  palindromes (meaning they read the same forward and backward)?

Here is the SOLUTION.

THE SOLUTION:

90.

The numbers are:

101

111

121

131

141

151

161

171

181

191

202

212

222

232

242

252

262

272

282

292

303

313

323

333

343

353

363

373

383

393

404

414

424

434

444

454

464

474

484

494

505

515

525

535

545

555

565

575

585

595

606

616

626

636

646

656

666

676

686

696

707

717

727

737

747

757

767

777

787

797

808

818

828

838

848

858

868

878

888

898

909

919

929

939

949

959

969

979

989

999

facebooktwitterreddit