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How many 13 digit numbers are possible by using the digits 1,2,3,4,5 which are divisible by 4 if repetition of digits is allowed?

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If one lady has 3 daughters and any 2 pairs out of 3 have difference of ages 3, and oldest will be 3 times than the youngest after 2 years then tell the age of oldest daughter. (40*40*40-31*31*31)/(40*40+40*31+31*31)=?