Let `R=gS-4` , when `S=8` and `R=16` . If `S=10` , then `R` is equal to (a) 11 (b) 14 (c) 20 (d) 21

If ^(20)C_(r+1)=^(20)C_(r-1), then r is equal to a.10 b.11 c.19d.12

If \ ^(20)C_(r+1)=\ \ ^(20)C_(r-1),\ t h e n\ r is equal to a. 10 b. 11 c. 19 d. 12

If R = (x^(2)+2)/(x-3) and S =(x-1)/x , then find (a) R + S (b) R - S (c) R.S (d) R/S

In Fig. 4.245, R S D B P Q . If C P=P D=11 c m and D R=R A=3c m . Then the values of x and y are respectively (FIGURE) 12 , 10 (b) 14 , 6 (c) 10 , 7 (d) 16 , 8

If (5+9+13+\ ddotto\ n\ t e r m s)/(7+9+11+\ ddotto\ (n+1)t e r m s)=(17)/(16) , then n= (a) 8 (b) 7 (c) 10 (d) 11

If (5+9+13+\ ddotto\ n\ t e r m s)/(7+9+11+\ ddotto\ (n+1)t e r m s)=(17)/(16) , then n= (a) 8 (b) 7 (c) 10 (d) 11

In Fig. 4.245, R S D B P Q . If C P=P D=11 c m and D R=R A=3c m . Then the values of x and y are respectively (FIGURE) 12 ,\ 10 (b) 14 ,\ 6 (c) 10 ,\ 7 (d) 16 ,\ 8

If p:q=3:4,backslash r:s=8:5backslash and backslash x:y=10:6 then psx:qry is equal to (16)/(25) b.(25)/(32) c.2 d.(75)/(32)

If S be the sum P the product and R be the sum of the reciprocals of n terms of a GP then p^2 is equal to S//R b. R//S c. (R//S)^n d. (S//R)^n