`(7. 5xx7. 5+37. 5+2. 5xx2. 5)` is equal to (a) 30 (b) 60 (c) 80 (d) 100

5 n+2 −6 xx 5 n+113 xx 5 n − 2 5 n+1 is equal to (a) 5 3 (b) − 5 3 (c) 3 5 (d) − 3 5

(5/7)^4 xx (7/5)^2 is equal to

The product 3 1/7xx1 5/6xx1 2/5xx1 1/(11) is equal to (a) 5 8/5 (b) 5 4/5 . (c) 8 4/5 (d) 4 4/5

3/5 xx 4[7- (2/5 xx (13 + 2))] is equal to :

Simplify: (5. 32xx56+5. 32xx44)/((7. 66)^2-(2. 34)^2) (a) 7.2 (b) 8.5 (c) 10 (d) 12

The H.C.F. of 2^4xx3^2xx5^3xx7, 2^3xx3^3xx5^2xx7^2 and 3xx5xx7xx11 is (a) 105 (b) 1155 (c) 2310 (d) 27720

If (x,3)+(2,5)=(7,8) then x is equal to a)2 b)5 c)7 d)9

What is (7/8xx7/8+5/6xx5/6+2xx7/8xx5/3)/(7/8xx7/8-5/6xx5/6) equal to? (41)/(24) (b) 1/(24) (c) 41 (d) None of these

(-2)/3 xx 3/5 is equal to A. (-2)/5 B. 5/2 C. (-5)/2 D. 2/5