Question

find the value of n and find also 21 term ​

Answer 1

Answer:

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Step-by-step explanation:

Sn = 4m-m

a1 = S1 = 4(1)2-(1) = 3 =

a2 = S2-S1 = 4(2)²-2-3 = 16-5 = 11

d = a2-a1 = 11-3 = 8

nth term is 107 (given)

Tn = 107

a1+(n-1)d = 107

3+(n-1)8 = 107

n-1 = 104/8 = 13

=> n = 14

Now,

20th term

T20 = a1+19d

= 3+19*8 = 3 + 152 = 155

Answer 2

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