4 .The sum of first 9 terms of an arithmetic sequence is 189 and its common difference is 4
a) What is its fifth term ?
b) What is its first term ?
c) Find the algebraic form of this sequence .
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Step-by-step explanation:
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Step-by-step explanation:
We will use the following formulas:
1. The general term of an AP is an=a+(n−1)d
where, a is the first term,
d is the common difference and n is the total number of terms in an AP.
2. The sum of n terms of an AP is given by
Sn=n2[2a+(n−1)d]
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