Question

9) Three coins are tossed together. Find probability to get all three heads. 10) For an A.P.d = -3, n = 18, an 18, an = -5, find 'a'. ' 11) Find zeroes of p(x) = 6x2 - 3 - 7x. 12) Find distance between A(a,b)and B(-a, -b).​

Answer 1

s={hh, ht, th, tt}{h, t}

={hhh, hht, hth, htt, thh, tht, tth, ttt}

n(s) =8

a={hhh}

n(a) =1

p(a) =n(a) /n(s)

=1/8

10.d=-3

n=18

t18=-5

tn=a+(n-1) d

-5=a+17(-3)

a=-5+51

a=46

11) p(0) =-3

12) 2√a^2+b^2