(1) +(1+1)+(1+1+1)+...+(1+1+1..+(n-1)) or 1+2+3+...+(n-1)
(1+1+1+1...+(n-1)) terms
(a)n(n-1)/2
(b) n(n+1)/2
(c) n
(d) n*n
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(1) +(1+1)+(1+1+1)+...+(1+1+1..+(n-1)) or 1+2+3+...+(n-1)
(1+1+1+1...+(n-1)) terms
(a)n(n-1)/2
(b) n(n+1)/2
(c) n
(d) n*n
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Answer:
n
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