a_{1},
a_{2},
a_{3}, ... ,
a_{n}

d

a_{i} =
a_{i+1} − d

a_{n} =
a_{1} +
(n − 1) d

b_{1},
b_{2},
b_{3}, ... ,
b_{n}

q, if | q | < 1, then progression is called infinitely decreasing progression

b_{i+1} =
b_{i} q

b_{i}^{2} =
b_{
i
− 1
}
b_{
i
+ 1
}

b_{n} =
b_{1}
q^{
(n −
1)
}

, | q | < 1

Logarithms formulas

Step by step solution of parametric derivative