exam Maths Puzzle Numerical Ability

find a formula for tn</sub> for the following:

0, -5, -10, -15...

1, -3, 9, -27...

2, 5, 10 ,17...

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exam Other Question

2( x + 4 ) - 5( x - 3 ) = 32 For an examination there are 4 sections of questions with 100 marks each. Againt each section there are 5 levels for results . each level will add certain points . Please confirm h