Solve the problem.What is the coefficient of a7c3 in the expansion of (a + 2b - 3c)10?
A. -720
B. 960
C. 120
D. -3240
Answer: D
Mathematics
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Match the surface show below to the graph of its level curves.
A. 
B. 
C. 
D. 
Mathematics
A computer password consists of any five capital letters from the ordinary English alphabet (A through Z).How many different passwords have no repeated letters?
A. 26 × 25 × 24 × 23 × 22 B. 25 C. 26 × 5 D. 265 E. none of these
Mathematics
Solve the equation.log2 (3x - 1) = 2
A. 
B. 
C. 
D. ?
Mathematics
Solve the problem.A man has 10 shirts and 9 ties. How many different shirt and tie arrangements can he wear?
A. 100 B. 81 C. 90 D. 180
Mathematics