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find the ratio of area of hexagon and equilateral triangle if their perimeters are equal.

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TCS Other Question

find the sum: 1*1!+2*2!+3*3!+.....+2401*2401! find the no. of ways in which a 6 digit no. can be formed from 1,2,3,4,5,6,7 such that the second last digit is always even.