exam Maths Puzzle Numerical Ability

how to prove that (1/2)*(3/4)*(5/6)*(7/8)*(9/10)*...(99/100)>=1/10

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exam Other Question

solve the solution

y=3^(2x+1)
y=9^(4-2x)

do you make the powers = one another for 2x+1=4-2x
Can someone show me how to Multiply and then simplify the product. All variables represent positive real numbers. Thanks

(5√p-6)^2