In how ways can the selection be made so that a particular member is always included?

As the person is always included, therefore, ∴ C_1 × 10C_4 = 1 × (10 × 9 × 8 × 7)/(4 × 3 × 2) = 210

How many km per hour does a man walk who passes through a street 1400 m long in 12 minutes?

A man travels some distance at a speed of 32 km/hr and returns at a speed of 24 km/hr. If the total time taken by him is 2 hrs 20 min, the distance is

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