Find the sum of first 25 term of AP whose nth term is 1-4n

1.	Find the sum of first 25 term of AP whose nth term is 1-4n
Answer» Take n is equal to 1 then 1 - 4n is equal to -3 the value of first term is -3. when we take n is equal to 2 then the value of second term is equal to -7.Now the common difference is 4 now using and sum formula -a25=93 Kese Take n =1,n=2

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