exam Maths Puzzle Numerical Ability

can you help with this one? Thanks

W^-4 / W^6

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exam Other Question

1. As the width of a confidence level increases, the lower bound ________ and the upper bound ________.

2. The batteries used in a digital watch have an operating life Write the first seven terms of each sequence:

a1=1 , a2=-1 , an=an-2-an-1 , n is greater/equal to 3