1 x 3 x 5 + 2 x 6 x 10 + 4 x 12 x 20
=15 + 120 + 960
= 135 + 960
=1095
1 x5 x 7 + 2 x 10 x 14 + 4 x 20 x 28
=35 + 280 + 2240
= 2555
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1 x 3 x 5 + 2 x 6 x10 +4 x 12 x 20 = 15+ 120 +960
=135+960
=1095
=
a)1x3x5+2x6x10+4x12x20=15+120+960
=1095
b)1x5x7+2x10x14+4x20x28=35+280+2240
=315+2240
=2555
1x3x5+2x6x10+4x12x20
=1x3x5+1x2x3x2x5x2+1x4x3x4x5x4
=(1x3x5+1x3x5+1x3x5)x2x2x2x4x4x4
=(15+15+15)x384
=(15x3)x384
=45x384
=17280
20 x X = 5 x28
X =5x28 /20
x =7