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1,7,8,49,50,56,57,343,344,350,351,392,393,399,400
The above sequence contains sum of distinct power of 7 in increasing order(7^0,7^1,7^1+7^0,7^2 etc.) What is value of term number 38 ? How many litres of concentrated 90% acid need to be mixed with 75% solution of concentrated acid to get a 3o litre soluton of concentrated acid