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  1. The next term of the sequence 1, 2, 5, 26, ... is :
    1. 677
    2. 47
    3. 50
    4. 152
Correct Option: A

The series is based on following pattern :
(1)² + 1 = 2
(2)² + 1 = 5
(5)² + 1 = 26
(26)² + 1 = ?
∴ ? = 677
Hence , required term in the sequence
= 677


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