A fair die is thrown 20 times. The probability that on the 10th throw, the fourth six appears is a.`"^20 C_(10)xx5^6//6^(20)` b. `120xx5^7//6^(10)` c. `84xx5^6//6^(10)` d. none of these

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

A die is thrown 560 times. The number 6 appears on the upper face 72 times. A die is thrown at random. What is the probability of getting 6.

The sum of the first 20 terms of the series (1)/(5xx6)+(1)/(6xx7)+(1)/(7xx8)+backslash is (a) 0.16(b)1.6c(c)16(d) None of these

Radium has atomic weight 226 and half life of 1600 years. The number of disintegrationsd produced per second from one gram is a. 4.8 xx 10^(10) b. 3.7 xx 10^(20) c. 9.2 xx 10^(6) d. 3.7 xx 10^(8)

A speaks the truth 4 out of 5 xx.He throws a die and reports that there was a 6, the probability that actually there was a 6 is

write the product in lowest terms. 3""13/20 times 6""5/10 times 5

0.000006723 when expressed in scientific notation,is 6723xx10^(-5) (b) 67.23xx10^(-7) (c) 6.723xx10^(-6)(d) None of these

Henry 's law constant for the solubility of N_(2) gas in water at 298 K is 1.0 xx 10^(5) atm . The mole fraction of N_(2) in air is 0.6 . The number of moles of N_(2) from air dissolved in 10 moles of water at 298 K and 5 atm pressure is a. 3.0 xx 10^(-4) b. 4.0 xx 10^(-5) c. 5.0 xx 10^(-4) d. 6.0 xx 10^(-6)