jet1445 wrote:

Q5:

Is lxl < 1?

(1) lx + 1l = 2lx - 1l

(2) lx - 3l ≠ 0

Q16:

If m, p, and t are positive integers and m < p < t, is the product mpt an even integer?

(1) t – p = p - m

(2) t – m = 16

Q5.

(1) Two cases: x+1 =2x-2 OR =-2x+2. In the 1st case, x=3; in the 2nd, x=1/3. Insuff.

(2) x<>3. Insuff.

(1&2) x has to be =1/3. Suff, then C.

Q16.

(1) Insuff. Take m, p, t = 1, 4, 7 and 1, 5, 9. In the 1st case mpt is even, in the 2nd case it´s odd.

(2) Insuff. Simple inspection.

(1&2) Insuff (take a similar example as in (1)), then E.