Question

Which of the following will come in place of the question mark (?) in the following sequence?

6C7, 8F10, 11J14, 15O19, ?

Answer 1

Given sequence is 6C7, 8F10, 11J14, 15O19, ? The pattern of the given series is as follows: The first digit of each set is in ascending order. 6 + 2 = 8, 8 + 3 = 11, 11 + 4 = 15. So first digit will be 15 + 5 = 20 In the same way the letters are also increasing.

$\begin{array}{ccc}C& D,E& F\\ F& G,H,I& J\\ J& K,L,M,N& O\end{array}$

So second letter will be

$\begin{array}{ccc}O& P,Q,R,S,T& U\end{array}$

Now like the first digits the last digits are also ascending; 7 + 3 = 10, 10 + 4 = 14, 14 + 5 = 19 respectively.

Therefore the last digit will be 19 + 6 = 25.

So, the next set of given sequence will be 20U25.