NECO 2015/2016 Mathematics Obj and Theory Answers Available Here

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Maths Theory

1a)
x:y:z*6:5:8
M=x/6=y/5=5/8
x:y:z*6m:5m:8m
1.8x=6m
y=3m
z=8m
12x-48/4y+2=12(6m)-8(8m)/
4(5m)+8m
=72m-72m/20m+8m
=0m/28m
=0

1b)
un=ar^1
us=ar46
2/81=2r^4
81×2r^4/81×2=2/81×2
r^4=1/81
r=4rot1/81, r=1/3.

ii)sum=a(1-r^n)/1-r
=2(1-(1/3)5)/1-1/3
=2(1-1/243)/2/3
=(242/243)/2/3
484/243-2/3
484/243×3/2
=242/81

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