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What elements bond with calcium? Calculate area of a trapezium ABCD with bases 24 cm, 10cm and sides 13cm , 15cm? If a, b and c are in continued proportion then show that (a²+b²) ∕ b(a+c) = b(a+c) ∕ b²+c²? How many permutations can be formed w the word COMPANY In these permutations how many wrds start with P and show reasoning.? How many grams of NaOH in 0.01l water are needed to make a 3.0m solution?