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प्रश्न
Find the mean of first six multiples of 3.
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उत्तर
The six multiples of 3 are 3, 6, 9, 12, 15, 18.
∴ Mean =`(3+6+9+12+15+18)/6` ..........(Here n = 6)
= `63/6`
= 10.5
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