The sum of terms of all terms of AP 7,10,13....is 1242 . Find the last term
Answers
Answered by
5
by using the formula
L = a+ ( n-1) × d
put n = 1242
find a1 and common difference (d)
you will get the ans...
L = a+ ( n-1) × d
put n = 1242
find a1 and common difference (d)
you will get the ans...
Answered by
5
Answer:
Step-by-step explanation:
S = 1242 = n/2{14+(n-1)3}
3n^2+11n-2484=0
3n^2-81n+92n-2484=0
3n(n-27)+92(n-27)=0
n= 27, -92/3
we take n=27
l=a+(n-1)d
l=7+26*3
l=85
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