in an A. P., t10 = 43 and d = 5. complete the following activity to find the first term of the A. P.
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Given : a = ?
d = 5
t10 = 43
n = 10
tn = a + ( 10- 1 )d
43 = a + (9)5
43 = a + 45
a + 45 = 43
a = 43 - 45
a = -2
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