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The nth term of an A.P. is 7 - 4n. Find the common difference.
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Ap=7-4n
- a1=7-4(1)=7-4=3
- a2=7-4(2)=7-8=-1
- d=a2-a1
- d=3-(-1)
- d=3+1
- d=4
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