can Bitcoin transactions are included in multiple blocks? Once the transactions published to blockchain and are included in blocks by miners. In that case there seems a high probability that a single transaction published can be included in multiple blocks created by different miners? is it true
Yes, theoretically, 2 blocks could be mined at (almost) the same time.
And then, it's also possible that one transaction could be included in those 2 blocks.
But then, there are 2 blockchains, but only one of them (the longest one) will finally be accepted by the network.
So your transaction could be in 2 blocks, but only one time in a blockchain.