Choose the missing term in the following alphanumeric series from the given alternatives:
2A11, 4D13, 12G17, ?, 240M31
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 48J23
In an alphanumeric series each part of the term follows its own rule, so the first numbers, the letters and the last numbers are checked separately.
First numbers 2, 4, 12, ?, 240: multiplied by 2, 3, 4, 5 in turn (\(2\times2=4\), \(4\times3=12\), \(12\times4=48\), \(48\times5=240\)), so the missing number is 48
Letters A, D, G, ?, M: each is 3 places ahead in the alphabet (A, D, G, J, M), so the missing letter is J
Last numbers 11, 13, 17, ?, 31: the differences are 2, 4, 6, 8 (\(11+2=13\), \(13+4=17\), \(17+6=23\), \(23+8=31\)), so the missing number is 23