exam Maths Puzzle Numerical Ability

What is the common difference between successive terms of the sequence generated by tn=-1/3n+1/2? Can someone show me an example to help me understand this? I know the answer is -1

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exam Other Question

P R T
X
M S Z
---------------------
W R M A
W S C W *
W P W M *
----------------------
W T V V Z A

what is the value of C+S+P?
a)45 b)28 c)9 d)5
What three consecutive numbers who sum is 0