21st term of an arithmetic sequence 21, 20, 19........
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AP = 21, 20, 19, ...................
21st term ( a21 ) = ?
first term ( a1 )= 21
a2 = 20
difference ( d ) = a2 – a1
= 20 – 21
= –1
a21 = a + 20d
= 21 + 20*–1
= 21 – 20
= 1
the 21st term of an AP is 1.
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