Find the Sum of an Arithmetic Series on the Casio FX-991EX Classwiz Calculator - A2 maths

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This video shows how to calculate the sum of the first 20 terms of the arithmetic series 2x+3 where x goes from 1 (the first term) to 20 (the last term)
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Hi teacher. Can i asked one question that i haven't "x" in calculator . so what should i do now??
Please i will be great full when you will sort out my problem!!!

aneeshamalik-hltw
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How can change the X variable for Y variable?

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