crwth

Indeed, and would have earned full marks had he said that, or even showed any awareness that his intermediate results were somehow nonstandard.

I had a student tasked with summing a finite geometric sequence with |r|>1, let’s say 1+2+4+8+16. He had apparently forgotten the formula for that, but knew the formula for the infinite series a/(1-r). Good enough he thinks, and sums 1+2+4+… = -1, then subtracts off the excess terms 32+64+128+… = -32, and gets the correct answer of 31.

Jingle bells Jingle bells, Santa Claus is dead // GI Joe the Eskimo shot him in the head.

Row row row your boat, gently down the stream // Throw your teacher overboard and listen to her scream.

Mine eyes have seen the glory of the burning of the school // We have tortured every teacher and we’ve broken every rule.

Chinese, Japanese, Dirty knees, Look at these.

If she’s used all the pieces and solved enough to reverse engineer the shape of all the missing pieces, then it is fully solved. If the missing pieces cannot be individually identified due to shared edges, then it is still solved, but is no longer a 1000 piece puzzle and she should only claim to have solved the 999 or 998 piece subpuzzle.