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for (2) : -1, 0, 1 satiesfies and is in AP, many other numbers dont satisfy hence not sufficient.

for (1) take p,q,r as a-d, a, a+d and solve, you'll find sequences like 2-\sqrt{2}, 2, 2+\sqrt{2} satisfies, many other numbers not, hence not sufficient.

combining, p,q,r it would prove that no p,q,r may exist that would satisfy AP properties, so I believe C should be the answer.
amanvermagmat
Are the integers p, q, r in an arithmetic progression?

(1) q = p*r

(2) q = p + r
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2407adi
for (2) : -1, 0, 1 satiesfies and is in AP, many other numbers dont satisfy hence not sufficient.

for (1) take p,q,r as a-d, a, a+d and solve, you'll find sequences like 2-\sqrt{2}, 2, 2+\sqrt{2} satisfies, many other numbers not, hence not sufficient.

combining, p,q,r it would prove that no p,q,r may exist that would satisfy AP properties, so I believe C should be the answer.
amanvermagmat
Are the integers p, q, r in an arithmetic progression?

(1) q = p*r

(2) q = p + r

Please check this reply: https://gmatclub.com/forum/are-the-inte ... l#p2228758 Hope it helps explain why the answer is E.

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