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CTET 1 Mar 2026 Paper 1, Question 31

Topic: Patterns

Q31

What is the sum of the next two numbers in the following pattern ?
13, 17, 19, 23, 29, ____, ____

  1. (1) 68Correct answer
  2. (2) 71
  3. (3) 69
  4. (4) 67

Solution.

CBSE answer: (1)

Answer: (1) 68

  1. The terms 13, 17, 19, 23, 29 are consecutive prime numbers.
  2. The next two primes after 29 are 31 and 37 (30, 32 to 36 all have factors).
  3. Sum =31+37=68= 31 + 37 = 68.

Trap: adding a fixed gap (like +4 or +6) gives 69 or 71; the gaps here are not constant.