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20= taken 1 times
21= taken 2 times
.
2n= taken n+1 times
hence total terms = 1+2+3+...+n+1=(n+1)(n+2)/2= 1000
or,n2+3n+2=2000
or,n2+3n-1998=0
n=(-3+√9+4*1998)/2= 43.22~43
Hence 1000th term is 243
Please acknowledge the correct result
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