S=n/2(2a+(n-1)d). If d=5, n=13, S=585 find the value of a.
1 answer:
Answer:
15
Step-by-step explanation:
Sum of 'n' terms formula is given by:-
s=n/2(2a+(n-1)d)
s=13/2[2xa+(13-1)5]
s=13/2(2xa+12x5)
s=13/2(2a+60)
585=13/2(2a+60)
585 x (2/13) = 2a + 60
90 = 2a + 60
90-60 = 2a
30 = 2a
a = 15
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