-4, 2
-3, 411
-411, 2
5, -3
Correct answer is C
2p - 10 = p+1+1−4P22 (Arithmetic mean)
= 2(2p - 100 = p + 2 - 4P2)
= 4p - 20 = p + 2 - 4p2
= 4p2 + 3p - 22 = 0
= (p - 2)(4p + 11) = 0
∴ p = 2 or -411
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