Question

Can anyone please tell me the answers..... Need it urgently!!!!!​

Answer 1

Answer:

answer 1-: d=3

Step-by-step explanation:

a=2, l=29, Sn=155

Sn=n/2[a+l]

155=n/2[2+29]

310=n[31]

310=31n

n=310/31

n=10

a10=a+9d=29(given)

=2+9d=29

=9d=29-2

=9d=27

d=3

answer2-:

k,k-2,3k

d=(k-2)-k (I)

Also,d=3k-(k-2) (ii)

Equating (I) and (ii)

(k-2)-k=3k-(k-2)

k-2-k=3k-k+2

k-3k=2+2

-2k=4

k=-4/2

k=-2