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Find the value of (5a^6)\ xx\ (-10 a b^2...

Find the value of `(5a^6)\ xx\ (-10 a b^2)\ xx\ (-2. 1 a^2b^3)\ ` for`\ a=1\ a n d\ b=1/2dot`

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`5a^6times(-10ab^2)times(-2.1a^2b^3)`
Putting `a=1` and `b=1/2`
`=5(1)^6times(-10)times1times(1/2)^2times(-2.1)(1)^2times(1/2)^3`
`=5times(-10)times1/4times(-2.1)times1/8`
`=105/32`.
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