4] Similar to \#1 in the practice section. Calculate these sums: f. i=0n(5j+1) Hint: Is this a geometric sum? Write out the entire sum for n=4 : Point out the two differences from the sum from the practice section j=1n3j+1 : Calculate the sum: Final formula: g. 1n1ni(j+1) Point out the one difference from the sum from the practice section i=1ni=1nij : Calculate the sum: Final formula