Fri August 10, 2012 By: Saesha Verma

Q1 the two APs have same common difference the first term of one of these is 3 and that of other is 8 what is the difference between their 10th term Q2 An AP consists of 21 terms.the sum of the three terms in the middle is 129 and sum of three consecutive terms from the end is 237 find AP Q3 Two APs have the same common difference The difference between their 50th term is 111 What is the difference between their 150th terms

Expert Reply
Fri August 10, 2012
We would request you to please ask one question at a time. The answer to your first question is as follows:
For 1st AP:
First term = 3
Common difference = d
For 1st AP:
First term = 8
Common difference = d
We know nth term of an AP is given by:
an = a + (n - 1)d
Thus, required difference
= 8 + (10 -1) d - 3 - (10 - 1)d
= 5

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