Question

find the sum to n term of AP 5,2 - 1 - 4 - 7

Answer 1

Number of terms (n) : 5
a = 5
am = l = - 7
Sum of this A. P
Sn = n/2 (a + L)
S5 = 5/2 [5 + (-7)]
S5 = 5/2 x (-2)
= - 5
THEREFORE, the sum of this A. P. = - 5

Answer 2

Answer:

Hey mate

Tn = 8 - 3n

Step-by-step explanation:

Tn = a + (n - 1)d. [ a = 5 , d = (-3) ]

Tn = 5 + ( n - 1) * (-3)

Tn = 5 + [ (-3n) + 3 ]

Tn = (5 - 3n + 3)

Tn = (5 + 3 - 3n)

Tn = 8 - 3n.........(answer)✌️✌️