?:6::12:20
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3.6
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Let the missing no. be x
Then,
x:6::12:20. {extremes=x , 20 &
means=6,12}
Product of extremes = Product of means
→ 20× x= 6 × 12
→ x= 6 × 12/20
→ x= 72/20
→ x= 18/5
18/5:6 :: 12:20
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