O1, O2 and O3 are three consequetive offsets at common distance apart. The area of strip by Simpson's rule is . . . . . . . .
A. $$\frac{d}{2}\left( {{O_1} + 4{O_2} + {O_3}} \right)$$
B. $$\frac{d}{3}\left( {{O_1} + {O_2} + {O_3}} \right)$$
C. $$\frac{d}{2}\left( {{O_1} + 2{O_2} + {O_3}} \right)$$
D. $$\frac{d}{3}\left( {{O_1} + 4{O_2} + {O_3}} \right)$$
Answer: Option D
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