Bihar concluded the league stage with an unassailable 30 points and grabbed the solitary qualifying berth from the spot from the plate group.
Bihar captain Keshav Kumar (4/21) triggered the collapse before left-arm spinner Ashutosh Aman stole the limelight with scintillating figures of 4-2-2-3, as Mizoram folded for 83 in 27.2 overs after electing to bat at the Motibaug Stadium.
Bihar cruised home in 15.4 overs with opener Vikash Ranjan remaining unbeaten on 59 on the way to registering their seventh win from eight matches with one being a washout.
At Nadiad, Uttarakhand registered a commanding 108-run win over Arunachal Pradesh but it was insufficient as they finished two points behind Bihar, having lost to them in the group league stage.
At Nadiad: Uttarakhand 264; 49.4 overs (Saurabh Rawat 67, Malolan Rangarajan 50; Sams Alam 2/39, Sandeep Thakur 2/41, Kshitiz Sharma 2/45) beat Arunachal Pradesh 156/9; 50 overs (Akhilesh Sahani 41; Rajat Bhatia 3/17, Malolan Rangarajan 2/12, Mayank Mishra 2/26) by 108 runs.
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