Question : Directions: Select the option that will replace the question mark to complete the given series. 40, 50, 61, 73, 86, ?, 115
Option 1: 100
Option 2: 98
Option 3: 105
Option 4: 99
Correct Answer: 100
Solution : Given: 40, 50, 61, 73, 86, ?, 115
Add consecutive natural numbers to the previous term to obtain the next term. 40 + 10 = 50; 50 + 11 = 61; 61 + 12 = 73; 73 + 13 = 86; 86 + 14 = 100; 100 + 15 = 115
So, 100 is the required term in the given series. Hence, the first option is correct.
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