[" 39.For each natural number "k" ,let "C_(k)" denote the circle with "],[" radius "k" centimetres and centre at the origin.On the circle "],[C_(k)" a particle moves "k" centimetres in the counter-clockwise "],[" direction.After completing its motion on "C_(k)," the particles "],[" moves to "C_(k+1)" in the radial direction.The motion of the "],[(1,0)" .If the particle crosses the positive direction of the "],[x" -axis for the first time on the circle "C_(n)" ,then "n=],[[" (a) "8," (b) "7],[" (c) "6," (d) "5]]

For each natural number k. Let C_(k) denotes the circle with radius k centimetres and centre at origin. On the circle C_(k) a particle moves k centrimetres in the counter-clockwise direction . After completing its motion on C_(k) the particle moves to C_(k+1) in the radial direction . The motion of the particle continue in this manner. The particle starts at ( 1,0). If the particle crosses the positive direction of the X -axis for the first time on the circle C_(n) , then n ="__________________" .

For each natural number k, let C_k denotes the circle radius k centimeters in the counter-clockwise direction.After completing its motion on C_k , the particle moves to C_[k+1] in the radial direction. The motion of the particle continues in this manner. The particle starts at (1,0).If the particle crosses the the positive direction of the x-axis for first time on the circle C_n ,then n equal to

For each natural number k, let C_k denotes the circle radius k centimeters in the counter-clockwise direction.After completing its motion on C_k, the particle moves to C_[k+1] in the radial direction. The motion of the particle continues in this manner. The particle starts at (1,0).If the particle crosses the the positive direction of the x-axis for first time on the circle C_n,then n equal to

For each natural number k, let C_k denotes the circle radius k centimeters in the counter-clockwise direction.After completing its motion on C_k , the particle moves to C_[k+1] in the radial direction. The motion of the particle continues in this manner. The particle starts at (1,0).If the particle crosses the the positive direction of the x-axis for first time on the circle C_n ,then n equal to

For each natural number k, let C_k denotes the circle radius k centimeters in the counter-clockwise direction.After completing its motion on C_k , the particle moves to C_[k+1] in the radial direction. The motion of the particle continues in this manner. The particle starts at (1,0).If the particle crosses the the positive direction of the x-axis for first time on the circle C_n ,then n equal to

For each natural number k, let C_k denotes the circle with radius k units and centre at the origin. On the circle C_k , a particle moves k units in the counter clockwise direction. After completing its motion on C_k , the particles moves to C_(k + l) , in some well defined manner, where l gt 0 . The motion of the particle continues in this manner. Answer the following question based on above passage : Let l= 1, the particles starts at (1, 0),If k in N and l = 1, the particles cross x-axis again at

For each natural number k, let C_k denotes the circle with radius k units and centre at the origin. On the circle C_k , a particle moves k units in the counter clockwise direction. After completing its motion on C_k , the particles moves to C_(k + l) , in some well defined manner, where l gt 0 . The motion of the particle continues in this manner. Answer the following question based on above passage : Let l= 1, the particles starts at (1, 0), if the particles crossing the positive direction of the x-axis for the first time on the circle C_n then n is equal to