Question

7.) Which is the rule for the nth term of the arithmetic sequence with ag =21 and aze=457.
a. an= 4n-11
b.an=4n-8
C. an= 4n+1
d. a = 4n+7
​

Answer 1

t

n

=4n−3

Put n = 1

∴t

1

=4×1−3

=4−3=1

∴ First term (t

1

)=1

Put n = 2

∴t

2

=4×2−3

=8−3=5

∴ Second term (t

2

)=5

$tn=4n−3</p><p>Put n = 1</p><p>∴t1=4×1−3</p><p>=4−3=1</p><p>∴ First term (t1)=1</p><p>Put n = 2</p><p>∴t2=4×2−3</p><p>=8−3=5</p><p>∴ Second term (t2)=5</p><p></p><p>$