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81*82*83*84*85*86*87*89. What should be in the unit place in this product?

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Patni Other Question

The product of two consecutive odd no is -1, then what is the value of the sum of them. Perimeter of an equilateral and isosceles is 45 and 40 respectively. At least one of the sides of isosceles is equal to the equilateral. What's the base of isosceles triangle?