Elitmus Exam Numerical Ability Probability

A lady bought five books namely A,B,C,D,E to distribute her 3 child. How many ways she can distribute books?

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Elitmus Other Question

35,80,143 are decimal notation of 120 in base a,b,c respectively. a,b,c are
1)airthmatic progression
2)geometric progression
3)prime number
4)c-b-a=1
a pole rests against a wall, and the tip of the pole is at a height of 8m. after sometime the pole slips back by 4m and falls on the ground.

what is the length of the pole?