Fill the missing number (?) in the given figure.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 26
Read clockwise from 5, the numbers are 5, 10, ?, 50, 122. Each is one more than the square of a prime number, the primes taken in order 2, 3, 5, 7, 11:
\(2^2+1=5\)
\(3^2+1=10\)
\(5^2+1=26\), the missing number
\(7^2+1=50\)
\(11^2+1=122\)