If `a/b=4/5a n d b/c=(15)/(16)t h e n(c^2-a^2)/(c^2+a^2)` would be `1/7` b. `3/4` c. `7/(25)` d. none of these

If (a)/(b)=(4)/(5)and(b)/(c)=(15)/(16) then (c^(2)-a^(2))/(c^(2)+a^(2)) would be (1)/(7) b.(3)/(4) c.(7)/(25) d.none of these

If (a)/(b)=(4)/(5) and (b)/(c)=(15)/(16), then (c^(2)-a^(2))/(c^(2)+a^(2)) is (a) (1)/(7)( b) (7)/(25)( c) (3)/(4) (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

8^(2.4)xx2^(3.7)xx-(16)^(1.3)=2^(?)4.8b.5.7c3.2d.3.6e. none of these

If 25 a+25 b=115 , what is the average of a and b ? (a) 2.5 (b) 3.4 (c) 4.5 (d) 4.6 (e) None of these

If \ ^(a^2-a)C_2=\ \ ^(a^2-a)C_4\ t h e n \ value\ of\ a\ is\ = a. 2 b. 3 c. 4 d. none of these

(3.5xx1.4)/(0.7)=?( a) 0.7(b)2.4(c)3.5(d)7.1 (e) None of these

If acostheta+bsintheta=4 and asintheta-bcostheta=3 , then a^2+b^2 = (a) 7 (b) 12 (c) 25 (d) None of these

The fractional part of 2^(4n)/15 is (n in N) (a) 1/15 (b) 2/15 (c) 4/15 (d) none of these

The value of tan[cos^(-1)(4/5)+tan^(-1)(2/3)] is 6/(17) (b) 7/(16) (c) (16)/7 (d) none of these