If the 18th term and 35 th term of an A.P are 56 and 124 respectivley , then find the sum of first 52 terms
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According to ur question
a +17d = 56
a+34d = 124
from second equation
a = 124-34d
on placing values in above equation
u will get
the value of d and by placing the value of d in any of the two equations u will get ur first term
then use the formula
Sn = n/2(2a+(n-1)×d)
by using it u will get your answer
Step-by-step explanation:
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