Math, asked by SumitiChaudhary5369, 11 months ago

The first term of an A.P are 7&49 respectively.If sum of all its term is 420,Find its common difference?

Answers

Answered by tesla369189

0

Step-by-step explanation:

First Term= 7

Last term=49

420=n×(7+49)/2

Gives n=5

49=7+(5-1)×d

4d=42.

Hence , d=10.5

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