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1. Calculate moles of K+ ions by multiplying MOLARITY and VOLUME IN LITERS.
2. 1 cm = 10^3 L
3. Get total moles of K+ ions by adding Moles of K+ in each solution.
4. Now calculate TOTAL VOLUME IN LITERS.
5. Use this formula
MOLARITY = TOTAL MOLES / TOTAL VOLUME IN LITERS