(a) xâ‚â‚‚ + xâ‚₃ + xâ‚â‚„ + xâ‚â‚… + xâ‚₆ + xâ‚₇ + xâ‚₈ (b) yâ‚‚z₃ + y₃zâ‚„ + yâ‚„zâ‚… + yâ‚…z₆ (c) γ₃ⵠλ₲ + γ₄ⵠλ₂²
Added by Charles A.
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(a) The expression x₁₂ + x₁₃ + x₁₄ + x₁₅ + x₁₆ + x₁₇ + x₁₈ represents the sum of seven terms, where each term has the form x followed by a subscript ranging from 12 to 18. Show more…
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Audrey F.
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Sam S.
Rewrite the following in $\sum$ notation: (a) $x_{1}\left(x_{1}-1\right)+2 x_{2}\left(x_{2}-1\right)+3 x_{3}\left(x_{3}-1\right)$ (b) $a_{2}\left(x_{3}+2\right)+a_{3}\left(x_{4}+3\right)+a_{4}\left(x_{5}+4\right)$ (c) $\frac{1}{x}+\frac{1}{x^{2}}+\dots+\frac{1}{x^{n}} \quad(x \neq 0)$ (d) $1+\frac{1}{x}+\frac{1}{x^{2}}+\cdots-\frac{1}{x^{n}} \quad(x \neq 0)$
Madhur L.
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