TCS Company Numerical Ability

a 3 digit number is divided successively in order by 4,5,6 leaving remainders 2,3,4. how many such numbers are possible?.
answer given -7

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TCS Other Question

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
s= 1/7 + 3/7^2 +7/7^3 + 13/7^4 + ........
s = ?
answer 25/108