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Class 11
>>Maths
>>Sequences and Series
>>Sum of n Terms of Special Series
>>100^2 - 99^2 + 98^2 - 97^2 + 96^2 + 95^2
Question
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100
2
−99
2
+98
2
−97
2
+96
2
+95
2
+....=S find S=?
Easy
Updated on : 2022-09-05
Solution
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Correct option is A)
S=100
2
−99
2
+98
2
−97
2
+96
2
−95
2
+94
2
+.....
=(100
2
−99
2
)+(98
2
−97
2
)+(96
2
−95
2
)+....
=(100−99)(100+99)+(98−97)(98+97)+(96−95)(96+95)+....
=1(100+99)+1(98+97)+1(96+95)+....
=100+99+98+97+96+95+.....
If S is finite S=100+99+98+97+96+....+1 written in reverse order
⇒S=1+2+3+....96+97+98+99+100
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Autor/a:
alfmartin
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