Question

find the common difference and wirte the 1st term
a)1,2,3,4
b)4,8,12,16

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Answer 1

first term is 1 and common difference is 1

b) first term 4 and common difference is 4

Answer 2

a) a=1 , d=a2-a1=2-1=1

b) a=4 , d=a2-a1=8-4=4

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