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2016-07-17T14:37:31+08:00
21928452131313131151331
1 5 1
2016-07-17T15:48:41+08:00
1.answer is 20th term= 119
to get the answer 
n=a1+(n-1)d
where in a1=5 and d=17-11=6

a20=5+(20-1)(6)
a20=119
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