Find: (ii) `8xx4.6`

Find: (i) 0.2xx6

Find : (ii) 0.1xx51.7

Find : (iii) 0.2xx316.8

Find : 36.8xx10

Verfiy the following: (-21) xx [(-4) + (-6)] = [(-21) xx (-4) ] + [(-21) xx (-6)]

If a fair coin is tossed 6 times. Find the probability of (i) at least five heads and (ii) exactly 5 heads.

Find r, if 5 xx ""^(4)P_(r) = 6 xx ""^(5)P_(r - 1) .

when a certain energy is applied to an hydrogen atom, an electron jumps from n =1 to n = 3 state. Find (i) the energy absorbed by the electron. (ii) wavelength of radiation emitted when the electron jump back to its initial state. ( Energy of electron in first orbit = - 13.6 eV , Planck's constant = 6.6225 xx10^(-34) Js, Charge on electron = 1.6 xx10^(-19) C, speed of light in vacuum = 3xx10^(8)ms^(-1)

Find: 20.1xx4

If A={7,8} and B={5,4,2}.Find A xx B