CSAT 2021

Q. Replace the incorrect term by the correct term in the given sequence
3, 2, 7, 4, 13, 10, 21, 18, 31, 28, 43, 40
where odd terms and even terms follow the same pattern.

(a) 0
(b) 1
(c) 3
(d) 6
Correct Answer: (a) 0

Question from UPSC Prelims 2021 CSAT Paper

Explanation : 

Taking the difference of consecutive odd terms we get the addition of 2 in consecutive difference starting with 4 while taking the same pattern in even terms we get consecutive difference is increasing by 2 except the first consecutive difference. So we need to correct the consecutive difference of 2 to 4 and change the term ‘2’ with ‘0’ to make it correct.

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