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If the nth term of an AP is $a_{n} = 4 n - 7$ , what is the difference between its 20th and 10th terms?

Class 10nth Term of an APAlgebra — Sequences

A36
B44
C80
D40

Step-by-Step Solution

a_{20} = 4 \times 20 - 7 = 73

;

a_{10} = 4 \times 10 - 7 = 33

. Difference = 73 - 33 = 40. (Or simply

10 d = 10 \times 4 = 40.

)

Answer: D) 40

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