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Mean proportional of two numbers 'a' and 'b' = √(ab)
Required mean proportional = √(2.56 x 8.41) = 1.6 x 2.9 = 4.64
150, 158, 131, 195, 70, ?
32, 64, 8, ?, 2, 4
12 48 192 ? 3072 12288
...3 8 26 93 ? 1985 11940
...What will come in place of the question mark (?) in the following series?
75, 219, 388, ?, 809, 1065
4, 4, 12, 60, ?, 3780
110, 112, 116, 122, 130, ?
178 168 148 ? 78 28
120, 120, ?, 360, 900, 2700
47, 72, 122, ?, 297, 422
