Question

An A.P is
given by 9, 17, 25 _ _ _ 637
find number of terms?

please answer it quickly!

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Answer 1

Answer:

77

Step-by-step explanation:

=> A. p. 9,17,25,...,637

First term(a) = 9

Common difference = 17 - 9 = 8

Last term (an) = 637

As we know

${a}^{n} = a + (n - 1)d$

637 = 9 + ( n - 1 ) *8

637 - 9 = 8 ( n - 1 )

628/8 = n - 1

78.5 - 1 = n

77.5 = n

therefore the, number of terms is 77

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