which term of the AP 21,18,15,...is -96
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So,
40th term is -96.
⠀⠀⠀⠀⠀➝ 40th term = a + 39d
⠀⠀⠀⠀⠀➝ 40th term = 21 + 39 ×-3
⠀⠀⠀⠀⠀➝ 40th term = 21 - 117
⠀⠀⠀⠀⠀➝ 40th term = -96
So,
we get -96 which is the 40th term of the given AP .
Hence Verified.