Which of the following numbers will replace the question mark (?) in the given series?
 10, 20 , 23, ?, 97, 582

Which letter-cluster will replace the question mark (?) to complete the given series?
 ERKV, HYVK, ?, NMRO, QTCD

Which number will replace the question mark (?) in the following number series?
 5, 4, 6, 15, 56, ?

Which of the following numbers will replace the question mark (?) in the given series?
 14, 14, 12, 36, 32, 160, ?

Which letter-cluster will replace the question mark (?) to complete the given series?
 ZFOE, PYUA, FRAW, VKES, ?

Which of the following numbers will replace the question mark (?) in the given series?
 569, 526, 483, 440, 397, ?

Which of the following numbers will replace the question mark (?) in the given series?
 4, 9, 17, 30, 50, 81, 125, ?

Which number from the options will replace the question mark (?) in the following series?
 3, 13, 53, 213, ?