Posted by victor on Tuesday, November 8, 2011 at 5:16pm.
.
since these are consecutive terms, their difference is the same, so
5-(x-2) = (x+2)-5
5-x+2 = x+2-5
7-x = x-3
2x = 10
x = 5
So, the three terms are 3,5,7
So, Tn = 1+2(n-1)
T20 = 1+2(19) = 39
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