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17. six identical coins are arranged in a row. The number of ways in which the number of tails is equal to the number of heads, is (a) 9 (b) 20 12 (c) 40 (d) 120 |
| Answer» 17. six identical coins are arranged in a row. The number of ways in which the number of tails is equal to the number of heads, is (a) 9 (b) 20 12 (c) 40 (d) 120 | |