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

Write a shell script in Linux/Unix to find Factorial of a given number.

---

echo "ENTER A NUMBER-"
read n
fct=1
i=1
while test $i -le $n
do
fct=`expr $fct \* $i`
i=`expr $i + 1`
done
echo "THE FACTORIAL OF THE NUMBER IS -" $fct

---

OUTPUT:

ENTER A NUMBER-
5
THE FACTORIAL OF THE NUMBER IS-120

Write a shell script in Linux/Unix to generate Fibonacci series.

---

tput clear

echo enter the range of the fibonacci series----

read n

echo -------------------------------------------------

a=0

b=1

i=2

echo $a

echo $b

while test $i -lt $n

do

c=`expr $a + $b`

echo $c

a=$b

b=$c

i=`expr $i + 1`

done

---

OUTPUT:

enter the range of the fibonacci series----

9

-------------------------------------------------

0

1

1

2

3

5

8

13

21