The correct expression is ‘ace in the hole’. It can also be ‘an ace up your sleeve’. It means ‘secret knowledge or a secret skill that will give you an advantage’. Discover our ace in the hole and see its excellent value for money for yourself.
80, ?, 240, 80, 20, 4
50, 64, 80, 98, 118, ?
64, 79, 109, 169, 289, ?
31 40 51 64 79 ?
25 25 37.5 ? 328.125 1804.6875
6 11 32 111 ? 2345 14100
...15.975 ×27.825 + (76.01)² + 12.98×18.426 = ?+ (79.09)²
72, 97, 147, ?, 322, 447
456, 460, 444, 508, 252, ?
48 49 45 54 ? 63 27
...