Cesium-137 undergoes beta decay and has a half-life of 30.0 years. Determine the number beta particles are emitted by a 14.0 g sample of cesium-137 in three minutes. got someone posted the answer for this question already but I still don't understand why we need to use the 1- infront of calculation please help me to explain this

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A: Step 1: Step 2: Step 3: Step 4:

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.