Fair mid on a dice product that voids on doubles

You quote a two-sided market on the product of two independent fair six-sided dice (a roll of 3 and 4 settles at 12) - but with a twist: if the two dice come up equal (a double), the contract voids and settles at 0. Where is the fair mid (to two decimals)?

Show hints (2)+
  1. Start from the plain E[XY]=3.5×3.5E[XY]=3.5\times3.5 (sum 441/36441/36), then remove the six doubles.
  2. The voided doubles still happen and settle at 00, so keep them in the 3636-outcome denominator.

Answer

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9.72 (± 0.01)

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Asked at: Timed Mental-Math & Sequences, Game-Based Aptitude

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