Write a shell script in Linux/Unix to find out the value of nCr.

---

clear
echo “ Enter values for n & r”
read n
read r
t=0
i=1
a=1
b=1
c=1
d=0
while [ $i –le $n ]
do
a=`expr $a \* $i`
i=`expr $i + 1`
done
i=1
while [ $i –le $r ]
do
b=`expr $b \* $i`
i=`expr $i + 1`
done
i=1
d=`expr $n - $r`
while [ $i –le $d ]
do
c=`expr $c \* $i`
i=`expr $i + 1`
done
i=`expr $b \* $c`
t=`expr $a / $i`
echo “ The Result Is = $t”

---

OUTPUT:

Enter values for n & r
4
2
The Result Is = 6