Question : Directions: In the following question a series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series. 15 (105) 14, 13 (?) 12
Option 1: 91
Option 2: 78
Option 3: 65
Option 4: 68
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Correct Answer: 78
Solution : Given: 15 (105) 14, 13 (?) 12
Multiply the first and the third numbers and divide the result by 2. Like, 15 (105) 14→(15 × 14) ÷ 2 = 105 Similarly, follow the same pattern for 13 (?) 12→(13 × 12) ÷ 2 = 78
So, the missing number is 78. Hence, the second option is correct.
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