Arre yaar, this one-to-one and onto thing was my nemesis! 😅 My trick? For one-one, draw lines parallel to x-axis on graph. If they cut function more than once, fail. For onto, see if graph's range covers all y-axis. But life lesson? My auto EMI is one-one—only one payment each month. But my income? Never onto, yaar, never covers all expenses! That's how I remember. 👍
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