Question

find the number of terms in 5,10,15,...105​

Answer 1

a = 5

d = +5

an = 105

n = ?

We know,

an = a + (n-1) d

105 = 5 + (n-1) 5

100 = (n-1) 5

20 = n-1

n = 21

Thus, the given AP has 21 terms :)

Answer 2

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