Question

Two APs (Arithmetic Progression) have the same common difference. The first term of one of these is -1 and that of the other is -8. Find the difference between their 4th term.

Answer 1

Answer:

10th term of an a.p is -27---> a + 9d = -27

" 5th term is -12" ----> a + 4d = -12

subtract them , the a's drop out and you can find d

then find a

then use your formulas for term(18) and sum(25)

Hope it helps you

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