उत तर:
स पष ट करण:
उत तर:
स पष ट करण:
म न ल त म ह र प स ह
ल ख रह ह
-
# "" ^ 0 D_k = 1 # -
# "" ^ 1 ड _क = क # -
# "" ^ n D_1 = 1 # -
# "" ^ n D_2 = "" ^ n D_1 + "" ^ (n-1) D_1 + … + "" ^ 0 D_1 = n + 1 # -
# "" ^ n D_3 = "" ^ n D_2 + "" ^ (n-1) D_2 + … + "" ^ 0 D_2 # # = (n + 1) + (((n-1) +1) + … + (1 + 1) + (0 + 1) = 1/2 (n + 1) (n + 2) # -
# "" ^ n D_4 = "" ^ n D_3 + "" "^ (n-1) D_3 + … +" "^ 0 D_3 # # = 1/2 (n + 1) (n + 2) + 1/2 ((n-1) +1) ((n-1) +2) + … + 1/2 (0 + 1) (0 + 2) #
# = 1/6 (n + 1) (n + 2) (n + 3) #
# "" ^ n D_5 = "" ^ n D_4 + "" ^ ((n-1) D_4 + … + "" ^ 0 D_4 # # = 1/6 (n + 1) (n + 2) (n + 3) +1/6 ((n-1) +1) ((n-1) +2) ((n-1) +3) + … + 1/6 (0 + 1) (0 + 2) (0 + 3) #
# = 1/24 (n + 1) (n + 2) (n + 3) (n + 4) #
इसल ए:
# "" ^ 9 D_5 = 1/24 (9 + 1) (9 + 2) (9 + 3) (9 + 4) = 715 #