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Arithmetic Progressions — MATHS STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceMATHSArithmetic Progressions1 Mark
Question
Find the sum of the following arithmetic progression:
50, 46, 42, ... to 10 terms.
✓

Answer

50, 46, 42, ... to 10 terms $\text{s}_\text{n}=\frac{\text{n}}{2}[2\text{a}+(\text{n}-1)\text{d}]$ $\text{s}=\frac{10}{2}[2\times50+(10-1)(-4)]$ $=320$

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