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If w < x < y < z, is wxyz > 0? (1) wz > 0 (2) xy > 0

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Re: If w < x < y < z, is wxyz > 0? (1) wz > 0 (2) xy > 0 [#permalink]
IMO Ans. A
1) Inequality wz>0 specifies that both w and z are either +ve or -ve at a time.
As per inequality w<x<y<z, x and y lie between w and z. Hence, x and y will either be +ve or -ve respectively for corresponding +ve or -ve value of w and z.
2) xy>0. Insufficient.
Re: If w < x < y < z, is wxyz > 0? (1) wz > 0 (2) xy > 0 [#permalink]
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