Third term of AP is 5 and seventh term of AP is 13 then its common difference is
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Step-by-step explanation:
- given third term is 5
- A3=a+(3-1)d
- 5=a+2d
- a=5-2d........(1)
- given seventh term is 9
- A7=a+(7-1)d
- 9=a+6d
- a+6d=9
- a=9-6d.......(2)
- from 1 and 2
- 5-2d=9-6d
- 6d-2d=9-5
- 4d=4
- d=4/4
- d=1
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