Question

21st term of the series 16, 11, 6....... is

Answer 1

Step-by-step explanation:

a=16

d=5

n=21

An=a+(n-1)d

16+(21-1)5

16+100

-116

Answer 2

Answer:

$a_{21} = - 84$

Step-by-step explanation:

$AP = a_1 \: , \: a_2 \: , \: a_3 \: ,.....a_n \\ \\ d \: = a_2 - a_1 \\ \\ a_n = a + (n - 1)d \\ \\ Here , \\ \\ AP = 16 \: , 11 \: , 6 \: ........... \: a_n \\ \\ d \: = a_2 - a_1 \\ d = 11 - 16 \\ d = - 5 \\ \\ a_n = a + (n - 1)d \\ a_{21} = 16 + (21 - 1) - 5 \\ \\ a_{21} = 16 + 20 \times - 5 \\ \\ a_{21} = 16 + ( - 100) \\ \\ a_{21} = 16 - 100 \\ \\ a_{21} = - 84$

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