Question

which term of AP:21,18,15,...is -75

Answer 1

Hi ,there !!!!
Tn = a + ( n-1) × d
common difference = 18 -21 =- 3

-75 = 21 + ( n -1) × -3

=> -75 -21 => (n-1) ×-3

96 /3 = (n-1)

32 = n -1

n = 33 .


hence , 33 term will be -75 .


hope it helps you !!!

thanks !!!

Ranjan kumar

Answer 2

Answer:

Step-by-step explanation:

a : 21 d: 18- 21 = -3 an: -75. n: ?

an = a + (n -1) d

-75= 21 + (n-1) -3

-75= 21 - 3n + 3

-75 = 24 - 3n

-75 -24 = -3n

-99 = -3n

n= 99/3

n= 33