Average of 8 numbers = 12 Sum of 8 numbers = 12 × 8 = 96 Now the sum of numbers added, 2, 4, 8, 16 …….. 8 terms Sum of 12 terms S₁₂ = a`xx` (rn-1))/(r-1) = 2 `xx` (28-1))/(2-1) = 2×255 = 510 New average = (96+510)/8 = 75.75
61, 48, ?, 35, 87, 22
20 25 54 165 662 ?
...17 ? 2142 12852 64260 257040
...31 35 60 124 ? 441
...? 12 24 44 74 116
...64 48 36 22 16 8
25 13.5 12.5 20.75 39.5 ? 302.25
...6 10 ? 210 1672 16710
...Direction: Which of the following will replace ‘?’ in the given question?
2, ‘?’, 46, 136, 311, 605, 1086
12 23 65 ? 1239 7409
...
