A cricketer scores (x-1) runs in each match and scores a total of (x3-1) runs. How many matches did he play?
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let the average score till his 11 innings = x
According to the question
11x+6312=x+2
11x + 63 = 12x + 24
x = 39
12th innings average = 39 + 2 = 41
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