find the 15th term of an AP. 4,1,-2-5-8
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given
AP = 4 , 1 , -2 , -5 , -8
an = a + (n -1 )d
a = 4
d = 1 -4 = -3
n = 15
so, an = 4 +( 15 -1 ) * (-3)
an = 4 + 14* -3
an = 4 - 42
an = -38
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