Select the missing number that should come in place of '?':
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 87
Going clockwise round the centre from 3 (right) to 7 (bottom), 23 (left) and ? (top), each number is the previous one plus a power of the centre number 4:
\(3+4^1=7\)
\(7+4^2=23\)
\(23+4^3=23+64=87\)