Suriin ang malawak na saklaw ng mga paksa at makakuha ng mga sagot sa IDNStudy.com. Hanapin ang mga solusyong kailangan mo nang mabilis at madali sa tulong ng aming mga eksperto.

How many terms are there in arithmetic sequence with a common difference of 4 and with first and last terms 3 and 59, respectively?

Sagot :

The formula is:
[tex]n= \frac{a_n-a_1}{d} +1= \frac{59-3}{4} +1= \frac{56}{4} +1=14+1=15[/tex]

So there are 15 terms.
Formula:
               [tex] t_{n} = t_{1} + (n-1)d[/tex]

59 = [tex] t_{n} [/tex] - the nth term or could be the last term 
 3 = [tex] t_{1} [/tex] - the first term      
 4 = d - the common difference
 ? = n - the number of terms, the one we are solving for
(Substitute)

 [tex] t_{n} = t_{1} + (n-1)d[/tex]

59 = 3 + (n -1) 4
59 = 3 + 4n - 4
59 = 4n -1
59 + 1 = 4n
60 = 4n
60 / 4 = 4n /4
15 = n

So, n = 15.

There are 15 terms in the sequence.