in a stair case there are 10 steps a chjild can step in 1 or 2 at a time wat

1111111111- 1 way
111111112- 9!/(8!) ways=9 ways
11111122- 8!/(6!*2!) ways= 28 ways
1111222- 7!(4!*3!) ways= 35 ways
112222- 6!/(2!*4!)= 15 ways
22222- 1 way
so total ways= 1+9+28+35+15+1=89 ways
10 years agoHelpfull: Yes(14) No(0)
Ans is 89 .
Let x be number of 2 steps x can be 0,1,2,3,4,5
10c0+9c1+8c2+7c3+6c4+5c5=89.
10 years agoHelpfull: Yes(7) No(1)
fibonacci series 1 2 3 5 8 13 21 34 55 89
10 years agoHelpfull: Yes(2) No(2)
y we havent taken the case 1212121
10 years agoHelpfull: Yes(1) No(2)
55 way
10c1+10c2=55 way
10 years agoHelpfull: Yes(1) No(8)
5!/5!+6!/4!2!+7!/3!4!+8!/2!6!+9!/1!8!+10!/10!
=1+15+35+28+9+1
=89
10 years agoHelpfull: Yes(1) No(0)
89 ways.
9+28+35+15+2
10 years agoHelpfull: Yes(1) No(0)
89
10c0+9c1+8c2+7c3+6c4+5c5
10 years agoHelpfull: Yes(1) No(0)

in a stair case there are 10 steps. a chjild can step in 1 or 2 at a time.wat are ways that a child can climb up?