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a rectangle is divided into 4 rectangles of area 70,36,20,x where x=? answer given as 350/9

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TCS Other Question

in a circular track of length 100 m 3 persons A,B,C start together in same direction@ 10m/s, 8m/s while C travels in opposite direction with 15m/s. when all meet after first time? in a stair case there are 10 steps. a child is attempting to climb staircase. each time she can either make a step or 2. in how many different ways she can climb the staircase

1-10
2-21
3-36