Which term will replace the question mark (?) in the alphanumeric series given below?
B1, E2, H6, K21, ?, Q445
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → N88
Each term has a letter part and a number part, and the two follow separate rules.
The letters (each one 3 places after the one before):
B, E, H, K, so the next letter is K + 3 = N (and N + 3 = Q, as in Q445)
The numbers (multiply by 1, 2, 3, ... and add the same number):
\(1\times1+1=2\)
\(2\times2+2=6\)
\(6\times3+3=21\)
\(21\times4+4=88\)
\(88\times5+5=445\), which agrees with the last term, so the missing number is 88