Quiz Contest # 10

Quiz Contest and win 0.10 sbd by simple math solution.

Question: What number will sit in Empty space?

Rules:

1. Resteem and upvote this post.
2. Write Your Answer in comment.
3. If correct answer is more than one.. then winner (only one) will be select by Lottery.

Participate Quiz Contest and win 0.10 sbd. You will earn 0.10 SBD and offer is valid for 7 days.
thanks.
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source: 3joy2010 blogspot