Others Maths Puzzle Numerical Ability Permutation and Combination

if p happens q happens id q happens r happens if r happens then s happens if s has not happened what can be said?
1)p has happend
2)p has not happend
3)r has happend
4)nothing can be said on certainty with p q and r

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Others Other Question

8-{3/2+(3/5-1/2)}
a)6*2/5 b)7*2/5
c)8*2/5 d)9*2/5
suppose the length and breadth of the rectangle are 5cm and 10cm respectively and M is a pint along the corner of the circle what is the radius of the circle?
a)20cm
b)45cm
c)50cm
d)30cm