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3, 15, x, 51, 53,159,161
a) 17 b) 34 c) 54 d) 112

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17

in 3, 15, x, 51, 53,159,161
3*5=15
15+2=17
17*3=51
51+2=53
..
..
159+2=161
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here... the answer will be 17..
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ans a)17

3*5=15
15+2=17
17*3=51
51+2=53
53*3=159
159+2=161
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3,15,15+2=17,51,51+2=53,159,159+2=161
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17 ita sries
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TCS Other Question

in a box of one dozen, the ratio of broken eggs to unbroken eggs could be any of the following except
1::1
1:3
1:4
1:2 A father and his son go out for a walk-and-run every morning around a track formed by an equilateral triangle. The father's walking speed is 2 mph and his running speed is 5 mph. The son's walking and running speeds are twice that of his father. Both start together from one apex of the triangle, the son goes clockwise and the father anti-clockwise.Initially the father runs and the son walks for a certain period of time. There after, as soon as the father starts walking, the son starts running. Both complete the course in 45 minutes. For how long does the father run? Where do the two cross each other?