Question

the number of terms inan Ap 3,7,11,15,..................83 is _____
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Answer 1

Heya !

Given:-

• a = 3
• d = 4
• an = 83

To find:-

• n = no. of terms

Formula to be used :-

$\huge \fbox \blue{an=a+(n-1)d}$

Solution:-

$\implies$ an = a+(n-1)d

$\implies$ 83 = 3+(n-1)4

$\implies$ 80/4 = n-1

$\implies$ 20 = n-1

$\implies$ n = 21

Hence, the total no. of terms in this A.P. are 21.

Answer 2

Answer:

a= 3

d=4

l=83

solve by formula and you will find

344