Alphabet Pattern : 15

Program:

 #include<stdio.h>
int main()
{
int i,j,k,n;
char ch='a'-1;
printf("How many lines: ");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
for(k=1;k<=n-i;k++)
{
printf(" ");
}
for(j=1;j<=i;j++)
{
printf("%c ",ch+j);
}
printf("\n");
 }
return 0;
}

Output:

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