Infosys Company Numerical Ability Permutation and Combination

Q. There are five same model cars parked in the same direction in parking. If 3 cars are red, 1 is black and 1 is green, in how many ways they can be arranged in the parking?

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Infosys Other Question

Q. Find the total number of four digit numbers that can be formed using the digits 1,2,5,6. Q. 0,6,6,20,20,42,..... Next number in the series is?