Question

find the number of terms in A.P 3,6,5_______,81​

Answer 1

Answer:

27

Step-by-step explanation:

first term(a) = 3

last term(an) = 81

common difference(d) = a2-a1 = 6-3 = 3

to find: number of terms(n)

we know: an= a + (n-1)d

81= 3 + (n-1)3

78= (n-1)3

78/3=(n-1)

26=n-1

27=n

Answer 2

Answer:

First term (a) = 3

Last term (an)= 81

Common difference (d) = 6 - 3 = 3

solution is given in picture.

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