Answers

2015-11-29T16:52:14+05:30
This question is not clear to me..

4 3 4
that question is from progression chapter
of 10 class
math
2015-11-29T17:49:46+05:30
Question: In an AP,  a2 = 13, a4 = 3  find a1 and a3
Sol: Given 2nd term = 13   
2nd term = a + d
∴a + d = 13  ------------------(1)
Given 4th term = 3
And 4th term = a + 3d
∴a + 3d = 3 -------------------(2)
Solving (1) and (2)
subtracting (2) from (1)
      a + d = 13
      a + 3d=3
⇒      -2d = 10
⇒         d = 10/-2
∴d = -5
Substituting d in eq 1
⇒a + d = 13
⇒a + (-5) = 13
⇒a-5b=13
⇒a = 13+5
⇒a = 18
a = a1 = 18
a3 = a+2d
     = 18 + 2(-5)
     =18-10
 a3=8  
3 4 3
General series of AP is    a, a+d, a+2d, a+3d,.......   is main 2nd term   a+d hai isliye
okkkk i understood
thankx
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