MBA Exam Numerical Ability Permutation and Combination

In a staircase there are 4 steps. A person can jump one step, 2 steps, 3 steps or all 4 steps. In how many ways can he reach the top?If sumone cud post the approach, it wud be gr8

1) 2
2) 4
3) 6
4) 8
5) 10

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If the pth term of an HP is qr and the qth term is pr, then the rth term of the HP is?

1) pqr
2) 1/pq
3) pq
4) 1/pqr
5) 2/pqr
Two different solutions of honey, milk and water are mixed with each other three times in varying proportions. The concentration of honey and milk in the three resulting solutions are found to be (10%, 16%), (12%, 12%) and (16%, x%) respectively. What is the value of x?

1) 4
2) 7
3) 8
4) 10