1.

The first term of two A.P.s are equal and the ratios of their common differences is 1:2 . if the 7th term of first A.P and 21st term of the second A.P are 23 and 125 respectively. find two A.P.S ​

Answer»

ANSWER:

LET the first term of first A.P. be a and COMMON DIFF. be d.

Let the the first term of SECOND A.P. be a and common difference be 2d.

7th term =a+6d=23

a+40d=125 subtracting:-

34 d=102

d=102/34=3

a=5

first A.P.=5,8,11,14,17,20,23,......

second A.P=5,11,17,23,.....



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