A b 2 3 b c 4 7 July 8, 2019 16 32 64 128 A b 2 3 b c 4 5 c d 6 7 A b 2 3 b c 4 5 c d 3 7 A b 2 3 c d 4 7 If a b 2 3 b c 4 5 c d 3 7 If a b 2 3 b c 4 7 then find a b c A 2 b 3 b 4 c 5 vĂ a b c 70 (a+b+c) 3