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The pattern of the first line series is obtained as, -3 × 1 + 1³ = -2 -2 × 2 - 2³ = -12 -12 × 3 + 3³ = -9 -9 × 4 - 4³ = -100 -100 × 5 + 5³ = -375 Completing the next series as, 31, a = 31 × 1 + 1³ = 32 b = 32 × 2 - 2³ = 56 c = 56 × 3 + 3³ = 195 The value of c = 195
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