The value of `1/6+1/12+1/20......+1/90` is a. `1/5` b. `2/5` c. `3/5` d. none of these

The value of (1)/(6)+(1)/(12)+(1)/(20)+......+(1)/(90) is: (A) (1)/(5)(B)(2)/(5)(C)(3)/(5) ( textrmD ) none of these

Value of (1+1/3)(1+1/(3^2))(1+1/(3^4))(1+1/(3^8))........oo is equal to a.3 b. 6/5 c. 3/2 d. none of these

Value of (1+1/3)(1+1/(3^2))(1+1/(3^4))(1+1/(3^8))........oo is equal to a. 3 b. 6/5 c. 3/2 d. none of these

Value of (1+1/3)(1+1/(3^2))(1+1/(3^4))(1+1/(3^8))........oo is equal to a. 3 b. 6/5 c. 3/2 d. none of these

Value of (1+1/3)(1+1/(3^2))(1+1/(3^4))(1+1/(3^8))........oo is equal to a. 3 b. 6/5 c. 3/2 d. none of these

If z=1/((2+3i)^2), then |z| is (a) . 1/13 (b) . 1/5 (c) . 1/12 (d) . none of these

At x= (5pi)/(6), the value of 2 sin 3x+ 3 cos 3x is............. A) 0 B) 1 C) -1 D) None of these

Let A ,B ,C ,D be independent events such that P(A)=1//2,P(B)=1//3, P(C)=1//5, a n dP(D)=1//6. Then theprobability that none of A ,B ,C ,a n dD occurs a. 1//180 b. 1//45 c. 1//18 d. none of these

If y = (1)/(3) + (1*3)/(3 *6) + (1 * 3*5)/(3*6*9) +… then the value of y^(2) + 2y is a. 2 b.-2 c. 0 d . None of these

The total number not more than 20 digits that are formed by usingd the digits 0, 1, 2, 3, and 4 is a. 5^(20) b. 5^(20)-1 c. 5^(20)+1 d. none of these