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In how many ways can we distribute 10 identical pencils to 4 students so that each student gets atleast one pencil

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TCS Other Question

In the sample subtraction problem below, single digits are replaced by letters,
Find the values of 3*A + &*B + 4*C *D = ?
A5C1
3U79
------
397D

a) 80
b) 99
c) 89
d)96
1(1!)+2(2!)+3(3!)....2012(2012!)