Wrong term in two interleaved series or alternating operations

This type of question, asked 3 times: 18 Sep 2025 S1, 19 Sep 2025 S3, 22 Sep 2025 S1. All 3 questions below, oldest first.

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Question 1
18 Sep 2025 S1
25 $The series given below contains a sequence of numbers. Accordingly identify the incorrect combination 4, 5, 14, 14, 34, 36, 74, 68$
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Question 2
19 Sep 2025 S3
25 $The series given below contains a sequence of numbers. Accordingly identify the incorrect combination. 5, 8, 16, 19, 39, 41, 81$
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Question 3
22 Sep 2025 S1
25 $The series given below contains a sequence of numbers. Accordingly identify the incorrect combination.4, 9, 12, 12, 36, 16, 108 , 18 , 323 , 21$
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Question 1