5 10 40 80 320 640
4 a b c d e
Find the value of d.
The pattern of the first line series is obtained as: × 2, × 4, × 2, × 4, × 2 Therefore, the second line series can be completed on the basis of the same pattern as: 4, a = 4 × 2, b = 8 × 4, c = 32 × 2, d = 64 × 4 Hence, the value of d is 256
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