what is wrong with this??? please,can anyone help?

\begin{equation} \label{probabilityy}
P^{t}({E_{0})=P_{0}+(1-P_{0})P_{1}+ (1-P_{0})(1-P_{1})P_{2}+.......+P_{n}\Pi_{k_{0}}^{n-1}(1-P_{k})
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    This question appears to be off-topic because it's really not applicable to a wider audience (due to a typo). – Werner Jun 3 '14 at 14:31
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    Au contraire – this is actually quite a useful question, because the error message is regrettably such a useless one: ‘of course I can use \eqno in a maths mode – that's the point!’ that it distracts from the real problem. You can't use \eqno in an inner maths mode, and that's what TeX's objecting to. Ie, this is a silly brace matching error, but I didn't realise the problem when I hit it, until I found this question (doh!). The similar questions elsewhere on the site are less useful, because they distract with too many other errors. Sooooo, yet another 10 points for David. – Norman Gray Jan 5 '15 at 18:38
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    @NormanGray thanks:-) you can vote for re-open – David Carlisle Jan 6 '15 at 1:18

You have a spurious extra {

  • oh yeah!. thanks!. thanks for the quick and clear answer!. – Naema Jun 3 '14 at 14:18

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