InterviewSolution
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1). 122). 133). 154). 18 |
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Answer» As per given data - Average of first 9 numbers in series is 19 SUM of 9 numbers = average × 9 ⇒ Sum of 9 numbers = 19 × 9 = 171 & Average of 1st 4 numbers is 17 Sum of 1st 4 numbers = average × 4 Sum of 1st 4 numbers = 17 × 4 = 68 Also Average of LAST 4 numbers is 22 Sum of last 4 numbers = average × 4 Sum of last 4 numbers = 22 × 4 = 88 Sum of 9 numbers = sum of 1st 4 numbers + Middle number + sum of last 4 numbers ⇒ 171 = 68 + Middle number + 88 ∴ Middle number = 15 |
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