Question

13. Find the 11th term of the arithmetic sequence 12, 15, 18, 21...
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Answer 1

Answer: 42

Step-by-step explanation: nth term = first term +(n-1)xdifference between two terms

n=11

first term=12

difference between two terms= 15-12=>3, 18-15=>3, 21-18=>3

11th term => 12+(11-10)x3

=>12+30

=>42

Hope it helps you. All the best.

Answer 2

Step-by-step explanation:

we have a = 12

d = 3

n = 11

we know that

$a(n) = a + (n - 1)d$

so here, a(11) = 12 + (11-1)×3

=> a(11) = 12 + 10×3 = 42

hence 42 is ans.

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