in A.p d=2,t20=49,a=?
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a = ?
T20 = 49
d = 2
=> T20 = a + (20-1)d
=> 49 = a + 38
=> a = 49 - 38
=>
T20 = 49
d = 2
=> T20 = a + (20-1)d
=> 49 = a + 38
=> a = 49 - 38
=>
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