Find the 5th and 7th term of the series 1, 4, 7, 10,...? And their ratio is? Select:  A) 11/13  B) 17/13  C) 19/13  D) 21/13  E) 17/15
common difference = d = 4 - 1= 
<gadget id="calculator">4 - 1</gadget>
<output>3</output>
3 ,, n= 5, a = first term = 1-----   By using arithmetic progression , t5 = a + (n-1)*d = 1 + (5-1)*3 = 1+12= 
<gadget id="calculator">1+12</gadget>
<output>13</output>
13   Also 7th term , t7= a + (n-1)*d = 1 + (7-1) * 3= 
<gadget id="calculator">1 + (7-1) * 3</gadget>
<output>19</output>
19   Ratio= t7/t5 = 19/13 = ..... Ans - 19/13
<result>C</result>
Find the 5th and 7th term of the series 1, 4, 7, 10,...? And their ratio is?