RRB Government Jobs Exams

46) If x2 -16>0, which of the following must be true?
a) -4>x>4
b) -4>x

Read Solution (Total 2)

ans=(a) -4>x>4
x^2-16>0
=>(x-4)(x+4)>0
=>[(x-4)>0 and (x+4)>0] or [(x-4)4 and x>-4] or [x4] or [x -4>x>4
when x is -4,4 it becomes 0
when x is between -4 and 4 it becomes -ve
when x is less than -4 or greater than 4 it becomes +ve
11 years agoHelpfull: Yes(1) No(0)

x^2-16>0

x^2>16
x>mod (4)
so, x>4 or xx>4
10 years agoHelpfull: Yes(0) No(0)

RRB Other Question

In a sequence of integers, A(n) = A(n-1) - A(n-2), where A(n) is the nth term in the sequence, n is an integer and n>=3, A(1)=1,A(2)=1. Calculate S(1000), where S(1000) is the sum of first 1000 terms.
a) 2
b) 3
c) 4
d) 0
47) Two cyclists start training on an oval racecourse at the same time. The professional cyclist completes each lap in 4 minutes; the novice takes 6 minutes to complete each lap. How many minutes after the start will both cyclists pass at the same spot where they began to cycle?
a) 10
b) 8
c) 14
d) 12