Instructions

What should come in place of question mark (?) in the following number series ?

Question 108

55, 109, ?, 433, 865, 1729

Solution

Here, the nth term is obtained by general formula, nth term = Previous term *2 - 1
We have to find third term, third term = 109*2 - 1 = 218 - 1 = 217
Hence, option C is correct.
 


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