How to used Character set and Syntax with fortran language

Write a FORTRAN program to find sum of the series 100**2-99**2+98**2-97*...

Write a FORTRAN program to find the sum of 1 3 3**2 --------- 3**19

Write a FORTRAN program to find the sum of 1**2 2**2 3**2 4**2 ---------...

Write a FORTRAN program which evaluate the sum of the series 1+3+5+7+9...

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Print the positive odd numbers which less than 300 and not divisible by 11