Select the correct option to complete the following series. 13, 35, 57, 79, 911, _______, 1315
1113
Each term is formed by writing two consecutive odd numbers side by side.
13 = 1 and 3, 35 = 3 and 5, 57 = 5 and 7, 79 = 7 and 9, 911 = 9 and 11
Next: 11 and 13 = 1113
This is followed by 13 and 15 = 1315, which matches.
Hence, 1113.
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