Question

the nth term of 21,16,11,6

Answer 1

A.P. => 21,16,11,6 ----

Here, a = 21 and d = 16-21 = 5

Now, we know that,

an = a + (n-1)d

an = 21 + (n-1)5

an = 21 + 5n - 5

an = 16 + 5n

Therefore, nth term = (16 + 5n)

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