Puzzle Contest #9 - First to get all the correct answers wins 5 SBD, all attempts will receive an upvote.

Happy New Year Everyone,

Spectrum Economics is holding its ninth solve the puzzles contest. This post contains 4 puzzles. The first person to solve all the puzzles wins 5 SBD. If we do not get a winner, the prize money of this contest will be added to the available winnings of the next puzzle contest.

How to Enter

To enter requires 1 upvote. Each entrant into the contest is allowed a maximum of 2 attempts. The attempts need to be done in the comments section of the post. Some questions have several parts to them, all parts of each question need to be answered correctly for a chance to win.

I expect the answers to be presented in following format:

Answer 1
Answer 2
Answer 3a, 3b, 3c
Answer 4

The closing date and time for the contest is 6PM USA Eastern Time 08/01/2018. Responses after this time will not be accepted. The answers will be provided in the comments section after the contest closes. The explanations for the answers will be provided in a separate post a couple of days after the contest closes.

The winner of the contest will be announced in the comments section. The 5 SBD will be paid to the winner as soon as I receive the payout from the post. All attempts in the comments section will receive an upvote regardless of answers provided. That’s right, I am also rewarding participation. Good luck everybody. The value of the upvote will depend upon my voting power at the time.

Let the Contest Begin

Question 1: Which is the odd one out?

Question2: Which is the odd one out?

Question 3: Replace all the question marks with the correct answers

Question 4: Replace the question mark with the correct answer

Thank you for participating.