1. Doug held up a sheet of paper. “Look, Dad,” he said. “Our new phone number.” “That’s right. Seven figures to remember now. It was much easier with letters.” Harry smiled. “What about it?” “I found something,” replied the boy. “If you add the square of the first three figures to the square of the last four, you get the whole number again.” What was it?

The phone number was 919-2346

The phone number was 673-2398

The phone number was 588-2353