Question

the number of terms in the arithmetic progression 23.21.19.....5 is​

Answer 1

Given,

a=23

d=21- 23=- 2

n th term = 5

Let , n number of terms are there

we know that ,

n th term = a + (n - 1 )d

5 = 23 + (n - 1 ) - 2

5 = 23 - 2n + 2

2n = 23+2- 5

n = 20÷2 =10

so,10 number of terms are there in AP .

Answer 2

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