Determine the sum of first 35 terms of an ap . if a2=2; a7=22
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Answered by
15
Heya mate.....
A+d=2
A+6d=22
Subtracting both...
-5d=-20
D=4
Put value of d
A+4=2
A=-2
A35=a+34d
A35=-2+136
A35=134
Sum of 35 terms= 35/2[-2+134]
=2310
@skb
ashutoshmall:
wrong
Answered by
8
a2=2
a+d=2............(i)
a7=22
a+6d=22....... (ii)
from i and ii we get
a + d = 2
a+6d=22
- - -
-5d= -20
d=4
putting value of d=4 in equation (i)
a=-2
a+d=2............(i)
a7=22
a+6d=22....... (ii)
from i and ii we get
a + d = 2
a+6d=22
- - -
-5d= -20
d=4
putting value of d=4 in equation (i)
a=-2
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