exam Maths Puzzle Numerical Ability

Find the product: -5a to the second power(a to the second power-6a+7)

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exam Other Question

How many 6 digit numbers can be made with any combination and permutation of 3 and 7? (e.g. 377777, 737777, 777333, 733733, 333337) 4=log(base x)^2(x^8)