`-56-(-19)-21+23`

15-(17)-19-35-16,23-(40)-26-34-55,21-(?)-10-19-3

The value of (3)/(15) +(13)/(14)-(19)/(21) +(31)/(35) -(23)/(30) is :

Verify the following: (i) 19xx{7+(-3)}=19xx7+19xx(-3) (ii) (-23){(-5)+(+19)}=(-23)xx(-5)+(-23)xx(+19)

Verify the following: ( i ) 19xx{7+(-3)}=19xx7+19xx(-3)(-23){(-5)+(+19)}=(-23)xx(-5)+(-23)xx(+19)

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

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

The mean of the following distribution is 18. The frequency f in the class interval 19-21 is missing {:("Class ",11-13,13-15,15-17,17-19,19-21,21-23,23-25),("Frequency "," "3," "6," "9," "13," "f," "5," "4):} Determine f .

The value of cot sum_(n=1)^(19)(cot^(-1)(1+sum_(p=1)^(n)2p)) is equal to ( a )(21)/(19) (b) (19)/(21)(c)-(19)/(21) (d) -(21)/(19)

The value of cot sum_(n=1)^(19)(cot^(-1)(1+sum_(p=1)^(n)2p)) is equal to (a) (21)/(19) (b) (19)/(21) (c) -(19)/(21) (d) -(21)/(19)

The value of cotsum_(n=1)^(19)cot^(-1)(1+sum_(p=1)^(n)2p) is equal to (a) (21)/(19) (b) (19)/(21) (c) -(19)/(21) (d) -(21)/(19)