Question : Directions: Select the number that will replace the question mark (?) in the following series. 21, ?, 45, 180, 185
Option 1: 33
Option 2: 63
Option 3: 41
Option 4: 42
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Correct Answer: 42
Solution : Given: 21, ?, 45, 180, 185
Add and multiply the consecutive numbers alternately to the previous term to obtain the next term. 21 × 2 = 42; 42 + 3 = 45; 45 × 4 = 180; 180 + 5 = 185
So, 42 is the missing term in the given series. Hence, the fourth option is correct.
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