Quantitative Aptitude For Competitive Examinations (English) 7th Edition
123412344123444123444412…..
a)12 b)23 c)34 d)41 e)44
Ans: 3:2
f(1)=1+a+b+c+d
f(2)=16+8a+4b+2c+d
f(3)=81+27a+9b+3c+d
f(4)=256+64a+16b+4c+d
given
f(1)=f(2)=f(3)=f(4)
firstly
f(1)=f(2)
1+a+b+c+d=16+8a+4b+2c+d
7a+3b+c=15…………………………………………………..equ(1)
then
f(1)=f(3)
we get
13a+4b+c=40…………………………………………………..equ(2)
then
f(1)=f(4)
we get
21a+5b+c=85………………………………………………….equ(3)
solve equ(2)equ(1)
we get
6a+b=25………………………………..equ(4)
solve equ(3)equ(2)
we get
8a+b=45………………………………..equ(5)
solve equ(4) and equ(5) and put the value in other equactions for all the values
we get
a=10 ,b=35,c=50
proof
put the value of a ,b,c
we get
f(1)=f(2)=f(3)=f(4)
7. The diagonal of a square field is 200, and then find the area of a square.
Ans: 2*10^4
A.28m B.32m
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