Question

In an A. P first two terms are -3, 4 then 21st term=?

Answer 1

Answer:

21th term

Step-by-step explanation:

• Given A.P. is -3,4,11,18,----------t21th
• a=-3,tn =21,d =7
• tn=a+(n-1).d
• t24=-3+(21-1).7
• =-3+20×7
• =-3+140
• t24 =137
• 21th term is 137