Question

What is the common difference of an ap in which d2-d7=84

Answer 1

Answer:

a+(1)m-a-(6)m=84

5m=-84

m=-84/5

therefore

cd=-84/5

Answer 2

Answer:

Step-by-step explanation:

A 21 = 10

A 7 = 84

A = 12 let it be x and then

Ap = a + ( n-1 )d

Ap = 10 /21 + 11d

200 = 231 d

Thus d = 200/231

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