Q.*10. If a, b, c are positive such that a b 2 c 3 = 64 then least value of 1 a + 2 b + 3 c is - (A) 6 (B) 2 (C) 3 (D) 32 Share with your friends Share 0 Anuradha Sharma answered this Hi, Take numbers 1a,1b,1b,1c,1c,1cnow use AM≥GM1a+1b+1b+1c+1c+1c6≥1a×1b×1b×1c×1c×1c161a+2b+3c6≥1ab2c3161a+2b+3c≥61ab2c3161a+2b+3c≥6164161a+2b+3c≥6126161a+2b+3c≥612661a+2b+3c≥62≥3so c is the answer 0 View Full Answer Yash answered this so the answer is (C) 3 0