exam Maths Puzzle Numerical Ability

I tried to do this three times, but get lost in all the steps. Can you help me?

C(10,5)x C(15,8)
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C(12,11)

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exam Other Question

evaluate and simplify:
SQRT of 3(8 SQRT of 7- 4 SQRT of 3)
Hi I need someones help, I am supposed to evaluate ^-3sqrt of 64 if possible. I tried to do just that, but I keep coming up with the problem itself. I am not getting anything diffe