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  4. The 8 text th common term of the series S1=3+7+11+15+19+ ldots ldots S2=1+6+11+16+21+ ldots . is

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Q. The $8^{\text {th }}$ common term of the series
$S_1=3+7+11+15+19+\ldots \ldots$
$S_2=1+6+11+16+21+\ldots .$
is ______

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Solution:

$ T_8=11+(8-1) \times 20 $
$ =11+140=151$