Question

the 4th term from the end of an A.P. : -11, -8, -5, ........49 is​

Answer 1

Step-by-step explanation:

• given a=-11 and a2=-8
• and also last term or an=49
• now d=a2-a1=-8-(-11)=-8+11=3
• according to question
• an=a+(n-1)d
• 49=-11+(n-1)3
• 49+11=(n-1)3
• since, n-1=60/3
• n=20+1=21
• hence number of term are 21
• so 4th term from the term is 18th term
• now again according to question
• a18=a+(n-1)d
• a18=-11+(18-1)3
• a18=-11+17×3
• a18=-11+51
• a18=40
• hence the 4th term of this ap from end is 40.....

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