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If 7th and 13th terms of an A.P. be 34 a...

If 7th and 13th terms of an A.P. be 34 and 64 respectively, then its 18th term is

A

`87`

B

`88`

C

`89`

D

`90`

Text Solution

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The correct Answer is:
C
`a_7=34`
`=>a+6d=34 `.... (1)
Also,` a_13=64`
`=>a+12d=64` .... (2)
...
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RD SHARMA-ARITHMETIC PROGRESSIONS-Solved Examples And Exercises
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