A student was asked to find the arith...

A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and `x` . He found the mean to be 12. What should be the number in place of `x` ? (a) 3 (b) 7 (c) 17 (d) 31

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