TCS Company Logical Reasoning Number Series

In a base 7,a no. is written only using the digits 0,1,2-----6.The no. 21 in base 7 is equal to 2x7+1=15 in base 10.Similarly, 135 in base 7 is 1x72 + 3x7+5=75 in base 10.What is the sum of base 7 no.1234 and 6543 in base 7?

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TCS Other Question

How many four-digit no. contain the digits 3 or 6. In a staircase, there are 10 steos. A child is attempting to climb the staircase. Each time she can either make 1 step or 2 steps. In how many different ways can she climb the staircase?
Option
a) 10
b) 21
c) 36
d) None of these