`((13)^3+7^3)/((13)^2+7^2-?)=20` (a) 6 (b) 20 (c) 91 (d) None of these

Find x , if (13^3 + 7^3)/(13^2 + 7^2 - x) = 20

(3)/(4)(1+(1)/(3))(1+(2)/(3))(1-(2)/(5))(1+(6)/(7))(1-(12)/(13))=?(1)/(5)( b )(1)/(6)(c)(1)/(7) (d) None of these

By what number 4 3/5 be multiplied to get 2 3/7? (a) (391)/(35) (b) (85)/(91) (c) (91)/(85) (d) None of these

12(1)/(3)+10(5)/(6)-7(2)/(3)-1(4)/(7)=?( a) 11(13)/(14) (b) 13(11)/(14)(c)13(13)/(14) (d) 14(11)/(13) (e) None of these

By what number 4 3/5 be multiplied to get 2 3/7? (391)/(35) (b) (85)/(91) (c) (91)/(85) (d) None of these

11.71-0.86+1.78-9.20=?( a) 2.43 (b) 3.13 (c) 3.43 (d) 4.13 (e) None of these

Simplify: (13(4)/(7)xx13(4)/(7)-8(3)/(7)xx8(3)/(7))/(13(4)/(7)-8(3)/(7)) (a) 18 (b) 20( c) 22( d9) 24

A B C is an isosceles triangle. If the coordinates of the base are B(1,3) and C(-2,7) , the coordinates of vertex A can be (a) (1,6) (b) (-1/2,5) (c) (5/6,6) (d) none of these

If .^(20)C_(n+1) = ^ (n) C_(16) , then the value of n is a.7 b. 10 c. 13 d. None of these

Let (2x^(2)+3x+4)^(10)=sum_(r=0)^(20)a_(r )x^(r ) , then the value of (a_(7))/(a_(13)) is (a) 6 (b) 8 (c) 12 (d) 16