Engineering Economics
What is the type of annuity where the payments are made at the beginning of the each period starting from the first period?

Perpetuity
Ordinary annuity
Annuity due
Deferred annuity

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Engineering Economics
In a cash flow series:

All of these
The gradient in the cash flow may be positive or negative
Uniform gradient signifies that an income or disbursement changes by the same amount in each interest period
Either an increase or decrease in the amount of a cash flow is called the gradient

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