If the mean of first set of n observations is 6. The mean of second set of 3n observations is m and the combined mean of two sets is 21, then the value of m is
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꧁༺ ₦Ї₦ℑ₳ ƤℜɆĐ₳₮Øℜ ༻꧂
꧁༺ ₦Ї₦ℑ₳ ƤℜɆĐ₳₮Øℜ ༻꧂
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