Q21: Select the incorrect step while calculating definite integral ₁³(x² + e-x) dx as limit of sums. < I: f(x) = x² +ex, a = 1, b = 3, h = 2 n II: ₁³(x² + e-x) dx = 2 lim ²½ [ƒ(1) + ƒ (1 + ²) + ƒ (1 + ²) + ... + 1(1+²(n-1))] n18 III: ₁³(x² + e-x) dx = 2 lim ²/ [(1 + e−¹ ) + {(1¹ + ² ) ² + e¯(1¹ + ²)} + {(₁ + ²)² + 6 (¹+)} + + {(1 + ²(x-¹)² + 6 (¹+²+ ²)}]- n-∞ n 2 2 (n- 2(n-1 ... n C n 2 n-∞ IV: S₁³ (x² + e¯x) dx = 2 _lim ²/[(1 + (1 + ²)² + (1 + 3)² + ... + (1 + ²(n−¹)²³) + {e−¹ + e¯(¹+²) + e-(1¹+ ²2 ) + + 0 =(₁+²+ + ²)}} 2(n-1) 2(n- n V: S₁ (x² + e^x) dx = 2 lim :((-) + (7) 1 (1-(1+²) e-1 (1-e n-∞ 1−(1+²) 1-e-(1+1) (a) Only V (b) Only IV (c) Both IV and V (d) All are correct GO Đ

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