Pujara remained not out on 124 as India 'A' finished their innings at a daunting 328 for eight in 50 overs at the Saurashtra Cricket Association Stadium.
Faced with the challenge of chasing a huge target, Bengal were bundled out for 307 in 49.4 overs despite a captain's knock by Wriddhiman Saha who smashed 116 off 93 balls.
Earlier Murali Vijay, too, tasted at the top of the India 'B' batting order success as he hit a strokeful 79-ball 93 that contained eight fours and four sixes.
After opting to bat first, Pujara found the fence 10 times and cleared it twice during his 130-ball knock, while Kumar, coming in to bat at number nine, smashed seven fours and three sixes.
All-rounder Sandipan Das, who picked up five wickets for Bengal, did his job with the bat as well scoring a sedate half-century at number three.
Debabrata Das used the long handle to good effort, scoring a quickfire 49 off 27 balls but even his spirited effort did not matter in the end, as the winner did just enough to scrape through to the final.
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Among the bowlers, India pacer Munaf Patel returned impressive figures of four 39 from 11 overs while all-rounder Ravindra Jadeja had two to his name.
But it was Pujara, who led by example, less than 24 hours after his unbeaten knock of 158 against India 'A' went in vain. More