Show that the progression 13,8,3,-2,-7 is an A.P. Find its first term and the common difference
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Answer:
first term of this A.P is a1=13
common difference of an A.P is given by
(i.e.,d=a
n+1
−a
n
)
putting n=1 in above equation
d=a
2
−a
1
=8−13=−5
hence common difference for this A.P is d=−5
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