One +ve sign for every 2 -ve in either case.
B is the correct choice.
1.Stmt 1 not suff , as we can have a sequence with all positive or a seqence with 2 negatives and one positive evry three terms.
2. Stm2 is suff
If the 4th term is -ve either the third is -ve and 2nd is +ve or 3rd is +ve and 2nd is -ve .
case 1 : 3rd -ve , which means the first has to be -ve as thes econd is +ve , so we hv a sequence : - + - - +--+-... so 16 -ve and 8+ve (as in every three terms there is 2 -ve and 1 +ve)
case 2 : 3rd +ve , means 2nd is -ve and so 1st is also -ve , so sequence is : --+--+...
so total 16 -ve and 8 +ve ( same answer as case 1)
therefore B is suff .
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