MBA Exam

it takes the pendulum of a clock 7 seconds to strike 4 o'clock. how much time will it take to strike 11 o'clock?aproach please??!

1) 18 seconds
2) 20 seconds
3) 19.25 seconds
4) 23.33 seconds

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MBA Other Question

Consider an equilateral triangle of side length n, which is divided into unit triangles, as shown. Let f(n) be the number of paths from the triangle in the top row to the middle triangle in the bottom row, such that adjacent triangles in our path share a common edge and the path never travels up (from a lower to a higher row) or revisits a triangle. An example of one such path is illustrated below for n=5. Determine the value of f(2009).Approach Please

1) 2009!
2) 2009
3) 720
4) 540
5) None of These
a1,a2,a3,a4......a24 are in arithmetic progression and a1+a5+a10+a20+a24=225, then sum of series a1+a2+a3....+a24 is

1) 909
2) 75
3) 750
4) 900