p, q and r are three non-negative integers such that p + q + r=10. The maximum value of pq + qr+ pr + pqr is  :

a)  ≥40 and < 50

b) ≥ 50 and < 60

c) ≥ 60 and < 70

d) ≥ 60 and < 80

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adminAptitude
p, q and r are three non-negative integers such that p + q + r=10. The maximum value of pq + qr+ pr + pqr is  : a)  ≥40 and < 50 b) ≥ 50 and < 60 c) ≥ 60 and < 70 d) ≥ 60 and < 80