`3^3.5xx21^2xx42^2.5-:2^2.5xx7^3.5=21^?` a. 6.5 b. 8 c. 10 d. 12.5 e. None of these

3^(3.5)xx21^(2)xx42^(2.5)-:2^(2.5)xx7^(3.5)=21^(?) a.6.5 b.8 c.10 d.12.5 e.None of these

(18)^(3.5)-:(27)^(3.5)xx6^(3.5)=2^(7)3.5b.4.5c.6d.7e. none of these

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

6^(1.2)xx36^(?)xx30^(2.4)xx25^(1.3)=30^(5) a.0.1b.0.7 C.1.4d.2.6e. None of these

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

21xx7+3xx44-5-6xx7

21^(7)xx21^(6.5)=21^(12.4)18.9b.4.4c..5.9d13.4

(5.4-:3xx16-:2)/(18-:5xx6-:3) a.2 b.4 c.6 d.8

Solve 48. 2xx2. 5xx2. 2+?=270 (a) 6.5 (b) 2.8 (c) 4.9 (d) 3.4 (e) 1.2

A fair die is tossed eight times. The probability that a third six is observed in eight throw is (\ ^7C_(10)xx5^7)/(6^7) b. (\ ^7C_2xx5^2)/(6^8) c. (\ ^7C_2xx5^5)/(6^6) d. none of these