exam Maths Puzzle Numerical Ability

Find the sum of the series
1x2 + 2x2^2 + 3x2^3 +...+ 100x2^100

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exam Other Question

please help me solve this problem it says to simplify a. 3 radical 54 and b says radical 25x^2y^3 there are 35 machine parts and 8 are defective. what is the probability that you randomly select 5 parts that one will be defective?