Answer: 1.
- A 0
- B 1
- C e
- D e − 1
Correct answer: B. 1
Explanation: ∫ lnx dx = x lnx − x; from 1 to e this is (e − e) − (0 − 1) = 1.
The exact area under the curve from a to b (shaded) is approximated by a few rectangles, the Riemann sum idea behind the definite integral.