Can someone help me understant this proof?
2 answers:
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Answer:
Step-by-step explanation:
- given ap series : 8,3,-2,-7,-12....up to n terms
[the second term should be +3 or else it wont form AP series]
first term in the series: 8
common difference : 3-8 = -5
total terms : n
- the formula for sum of n terms in an ap =
a: first term
d: common difference
n : total terms
- by substituting value in the above formula,
- sum of the A.P:
=