book Maths Puzzle Numerical Ability

patterns and inductive Reasoning
fine the next three terms of each sequence

1) 6,8,12,18
2)3,-4,-11,-18
3)-11,-6,-1,-4

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book Other Question

If A is a invertible matrix and A^2 = I , Does A = I? here is my question i hav no clue about

find the expression that represents the product of 3 less than twice x and 2 more than the quantity 3 times x?