Select the letter that will come next in the following series.

L, M, K, N, J, O, ?

I

L, M, K, N, J, O, ?

The difference between consecutive terms is +1, -2, +3, -4, +5, -6 first alternate numbers are added and second alternate numbers are subtracted, such that:

The logic followed here is :

L → (+1) →M → (-2) → K  → (+3) → N → (-4) →I → (+5) → Q → (+6) → I

Thus, the missing term is I