Question

find T(30) of an A. P 10,7,4 —T30=—​

Answer 1

Step-by-step explanation:

a = 10 , d = -3 , t30 = ?

tn = a + ( n-1 ) d

t30 = 10 + ( 30 - 1 ) -3

t30 =10 - 87

t30 = - 77

Answer 2

Answer:

A.P. = 10, 7, 4..

Here,

a = 10

d = a² - a¹ = 7 - 10 = -3

A₃₀ = ?

Using AP formula,

An = a + (n - 1) d

A₃₀ = 10 + (30 - 1) -3

A₃₀ = 10 + (29) -3

A₃₀ = 10 - 87

A₃₀ = -77

Hence, the 30th term of A.P. = 10, 7, 4.. is -77.