The sum of 5th and 9th terms A.P is 72 and the sum of 7th and 12th tern is 97.Find the A.P
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A5 Plus A9 is equal to 72 and a 7 + 12 is equal to 97 so A5 Plus A9 is equal to 72
a + 4 d + a + 8 d is equal to 72
2A + 12 d is equal to 72 equation first
according to second equation a + 6d + a + 11d is equal to 97
2A + 17 is equal to 97 second equation
by using elimination method we get
5 d is equal to 25
d is equal to 5
put the value of the in equation first
show the value of a is equal to 6
hands DP is 6,11 ,17 ,23.............
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