Two APs have the same common difference. The first term of one of these is -1 and that of the other is -8 . Then the difference between their 4th term is a) -1 b) -8 c) 7 d) -9 Please give known answer CLASS X _CBSE EXEMPLAR
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Step-by-step explanation:
let A be the forth term of first A.P and a of second A.P
A(n)= first term+(n-1)d
A= -1+3d
a= -8+3d
A-a= -1+3d - (-8+3d)
= -1+8+3d-3d
therefore difference is 7