Question

for a given ap ,if d=(-4) n= 7 ,and an = 4 find a=
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Answer 1

Answer:

given,

d = -4. , n = 7 and an = 4

then,

an = a + ( n - 1 ) d

4 = a + ( 7 -1 ) -4

4. = a + ( 6 ) -4

4 = a - 24

4 + 24 = a

28 = a

hence the value of a is 28