Question

Decide whether the following sequence is an A.P.; if so, find the
20th term of the progression :
-12, -5, 2, 9, 16, 23, 30,

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Answer 1

the following sequence is an AP because subtracting the consecutive terms gives the. same common difference

t²⁰=a + (n-1)d

t²⁰= -12 + (20-1)7

t²⁰= -12 + 133

t²⁰= 121

therefore the 20th term for the given AP will be 121

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