book Maths Puzzle Numerical Ability

Find Ex for the following set of numbers:

-3, 5, -4, 8, -6, 10, -5


A) 5 B) 0 C) 2 D) 6


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book Other Question

evaluate the following expression

ab to the negative 1st power over c
How many ways can a president, vice president, secretary, and treasurer be chosen from a club with nine members?