ಧಾತುಗಳ ಪರಮಾಣು ಸಂಖ್ಯೆಗಳು `X,Y`, ಮತ್ತು `Z` ಕ್ರಮವಾಗಿ `19,21` ಮತ್ತು `23`.

-56-(-19)-21+23

The atomic numbers of elements X,Y ,and Z are 19,21 , and 23 , respectively. The number of eletron present in the M shells of these elements follows the order

(115)^96-(96)^115 is divisible by (A) 17 (B) 19 (C) 21 (D) 23

{:(2x + y = 23),(4x - y = 19):}

If the mean of 6,\ 7,\ x ,\ 8,\ y ,\ 14 is 9, then (a) x+y=21 (b) x+y=19 (c) x-y=19 (d) x-y=21

If the mode of 22, 21, 23, 24, 21, 20, 23, 26, x and 26 is 23, then x is ________.