TCS Company undefined

26,19,17,13,11,?,8,7

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TCS Other Question

in base 7,a number is written only using digits 0,1...6.the number 21 in base 7 is equal to 2*7+1=15 in base 10.similarly number 135 in base 7 is 1x72+3x7+5=75 in base 10.what is the sum of base 7 number 1234 and 6543 in base 7? A power unit is there by the bank of river of 750 meters width. A cable is made from power unit to power a plant opposite to that of the river & 1500 mts away 4m d power unit. The cost of cable below water is Rs 15/- per meter & cost of cable on the bank is Rs 12/-. Find d total cost of laying?(dis one is also very common )