Question

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Answer 1

Answer:

Given sequence us an A.P and 20th term is 124.

Step-by-step explanation:

Sequence has following pattern

This A.P has common difference of 7.

i) -5-(-12) = 7

ii) 2-(-5) = 7

iii) 9-2 = 7

first term,a= -12

common difference,d = 7

n= 20

Using formula of Arithmetic progression,

T(n=20) = a + (n-1)d

= -12 + (20-1)* 7

= -12 + 19*7

= -12 + 133

= 124

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