Question

for the A.P. -5,-3,-1 ... find the difference between its 30th term and 20th term​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

a1 = -5

a2 = -3

d = a2 - a1 = -3 -(-5) = 2

an = a + (n-1)d

therefore,

a30 = -5 + (30-1)2

= -5 + (29)2

= 58 - 5

= 53

a30 = 53

similarly,

a20 = -5 + (20-1)2

= -5 + (19)2

= 38 - 5

= 33

a20 = 33

So, difference between 30th term and 20th term is a30 - a20

= 53 - 33

= 20

Thus, difference between 30th and 20th term is 20.