Which letter-cluster will replace the question mark (?) to complete the given series?

BRCQ, EPFO, ?, KLLK, NJOI

Which of the following numbers will replace the question mark (?) in the given series?

$$ 69,65,67,63, ?, 61 $$

Which of the following numbers will replace the question mark (?) in the given series?

$5,20,60,240,720$, ?

Select the figure that will replace the question mark (?) in the following figure series. Question Figure