- Can you please explain the method of assertion and counter-assertion?

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If a and b are positive integers such that gcd(a,b)=210, lcm[a,b]=210^3, and a** **If a and b are roots of equation x^2 +x -12 =0 such that a>b then equation whose roots are 2a and 3b is ?Please!? How do the capacitors C1 and C3 affect frequency response ? Can Mucus be produced voluntary by some animals. Or wax voluntary in their ears anytime they want in any quantity.? If the fifth term of a geometric sequence is 81 and the common ratio is 3/4, find the sum of the first 20 terms?