Question

solve this..need it urgently​

Answer 1

Answer:

Sn = n/2 ( first term + last term )

150 = n/2 ( -4 + 29 )

300 = n ( 25 )

n = 12

Now,

Tn = a + ( n - 1 ) d

12th term is 29

So,

T12 = -4 + ( 12 - 1 ) d

29 = -4 + 11d

33 = 11d

d = 3

So, Common difference is 3 !

I hope this is helpful

Answer 2

Answer:

d=3

Step-by-step explanation:

a=-4

L=29

Sn=150

now,

Sn=n/2(a+L)

• 150=n/2(-4+29)
• 150×2=n(25)
• 300=25n
• n=300/25
• n=12

now nth term is 12

so L=a+(n-1)d

• 29=-4(12-1)d
• 29+4=(11)d
• 33=11d
• d=33/11
• d=3