Question

The first two terms of an ap are -5 and -6. It's 21st term will be the first terms of an ap are - 5 and - 6 is 21st term will be option number a350 900 number b - 315(a)315 (b)-315

Answer 1

Answer:

-25

Step-by-step explanation:

a = -5 .....( first term of an AP)

-6 = a + (n - 1)d

-6 = -5 + d .....( n=2 )

d = -1

t21 = a + (n-1)d

= -5 + (21 - 1)(-1)

= -5 - 20

= -25

t21 = -25